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        1 - Analysis and design of microwave resonant plasma source for Iranian Space Plasma Simulation Chamber
        HamidReza Mirzaei Moslem Kazemi Gholamreza Etaati Milad Abbasi Mahmood Karimi Kafshgari Hosein Rajabalinia Jelodar
        In the present study, the microwave resonant plasma source has been designed to provide the ionosphere like condition inside the Iranian Space Plasma Simulation Chamber (ISPSC). This chamber contains plasma with electron density of 1×105-1×1010 cm-3 and temp چکیده کامل
        In the present study, the microwave resonant plasma source has been designed to provide the ionosphere like condition inside the Iranian Space Plasma Simulation Chamber (ISPSC). This chamber contains plasma with electron density of 1×105-1×1010 cm-3 and temperature of 1-5eV. In order to reach these plasma parameters inside the ISPSC, the plasma source cylindrical cavity mode TE112 is used. Then, the produced plasma is transferred into the Chamber through the holes created on the end wall of the cavity. Since the plasma characteristics in the resonant cavity depend on the gas pressure and the input power, the microwave and plasma interaction, power absorption, electron density and temperature were evaluated by the Comsol Multiphysics and obtained results have been presented. پرونده مقاله
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        2 - Dynamics of a low-threshold optically pumped organic vertical-cavity surface-emitting laser
        Mohammad Reza Shayesteh Ghafar Darvish
        AbstractWe propose a low-threshold optically pumped organic vertical-cavity surface-emitting laser (OVCSEL). This device has the capability to apply both electrical and optical excitation. The microcavity structure consists of an organic light emitting diode with field- چکیده کامل
        AbstractWe propose a low-threshold optically pumped organic vertical-cavity surface-emitting laser (OVCSEL). This device has the capability to apply both electrical and optical excitation. The microcavity structure consists of an organic light emitting diode with field-effect electron transport inserted in a high-quality factor double distributed Bragg reflector. The simulated quality factor of the microcavity is shown to be as high as 16,000. Also, we investigate threshold behaviour and the dynamics of the optically pumped OVCSEL with sub-picosecond pulses. Results from numerical simulation show that lasing threshold is 12.8 pJ/0.64 µJ cm−2 when pumped by sub-picosecond pulses of λ = 400 nm wavelength light. پرونده مقاله
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        3 - Very compact photonic crystal resonant cavity for all optical filtering
        Hamed Seif-Dargahi Mahdi Zavvari Hamed Alipour-Banaei
        AbstractIn this paper, an all-optical filter is proposed which employs a resonant cavity localized between input and output waveguides as wavelength selecting part of the filter. We study the impact of different parameters on the filtering of the structure using plane w چکیده کامل
        AbstractIn this paper, an all-optical filter is proposed which employs a resonant cavity localized between input and output waveguides as wavelength selecting part of the filter. We study the impact of different parameters on the filtering of the structure using plane wave expansion and finite difference time domain methods. We also study the effect of the output waveguide position on the performance of the filter and results show that the proper position of the output waveguide is straight to the center of the resonant cavity. The initial form of filter is capable of selecting the optical waves at λ = 1,554.2 nm and the transmission efficiency of the filter is obtained about 100 %. The total footprint of the filter is پرونده مقاله
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        4 - بررسی اثرات ترمیمی PRP و نانوکامپوزیت های پلی کاپرولاکتون-هیدروکسی آپاتیت زئولیت بر بهبود زخم پس از کشیدن دندان
        علیرضا ساگارت علیرضا جهاندیده احمد اصغری ابوالفضل اکبرزاده پژمان مرتضوی
        نوع ترمیم زخم پس از کشیدن دندان یک فرآیند پیچیده است که به اصلاح زخم ها کمک می کند. داروهای پوشاننده زخم برای التیام بهتر مفید هستند. بهتر است که این عوامل کمترین تحریک التهاب زا و بیشترین خاصیت ضد میکروبی را داشته باشند. بررسی تاثیر نانوکامپوزیت‌های زئولیت پلی‌کاپرولاک چکیده کامل
        نوع ترمیم زخم پس از کشیدن دندان یک فرآیند پیچیده است که به اصلاح زخم ها کمک می کند. داروهای پوشاننده زخم برای التیام بهتر مفید هستند. بهتر است که این عوامل کمترین تحریک التهاب زا و بیشترین خاصیت ضد میکروبی را داشته باشند. بررسی تاثیر نانوکامپوزیت‌های زئولیت پلی‌کاپرولاکتون-هیدروکسی آپاتیت بر فرآیندهای بهبودی مخاط پوشاننده آلوئول پس از استخراج است. پانزده گربه سالم با درگیری دندان پرمولر پایین تعیین شدند و عمل کشیدن دندان انجام شد. نمونه برداری بیوپسی از مخاط محل کشیدن دندان در روز دهم پس از جراحی انجام شد. دندان پره مولار همه 15 گربه کشیده شد و سه گروه به عنوان کنترل، PRP و نانو پلیکاپرولاکتون-هیدروکسی آپاتیت زئولیت گروه بندی شدند. تجزیه و تحلیل هیستوپاتولوژیک نشان داد که برخلاف گروه کنترل و PRP، گروه نانو با حضور کمتر سلول های التهابی، بافت پوششی نامنظم کامل، بافت جوانه گوشتی بیشتر و فیبروز بیشتر روند بسیار بهتری را نسبت به گروه کنترل و گروه PRP داشت. نانوکامپوزیت پلی کاپرولاکتون-هیدروکسی آپاتیت زئولیت روند بهبودی زخم پس از کشیدن دندان را تسریع می کند. پرونده مقاله
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        5 - ایجاد شرایط آسایش در ساختمان با استفاده از سیستم ترکیبی سرمایشی ایستا
        مهنوش اقتداری عباس مهروان مریم انصاری منش سید علی نوری
        زمینه و هدف: افزایش جمعیت، رشد سریع تکنولوژی و از بین رفتن محیط زیست، موجب بر هم خوردن شرایط طبیعی در بسیاری از نقاط جهان شده است. در این میان ساختمان ها به دلیل مصرف زیاد انرژی های فسیلی و تولید گازهای گلخانه ای یکی از عوامل تهدید کننده توسعه پایدار به شمار می روند. اف چکیده کامل
        زمینه و هدف: افزایش جمعیت، رشد سریع تکنولوژی و از بین رفتن محیط زیست، موجب بر هم خوردن شرایط طبیعی در بسیاری از نقاط جهان شده است. در این میان ساختمان ها به دلیل مصرف زیاد انرژی های فسیلی و تولید گازهای گلخانه ای یکی از عوامل تهدید کننده توسعه پایدار به شمار می روند. افزایش مصرف سوخت های فسیلی در ساختمان به ویژه در بخش تهویه مطبوع، سهم عمده ای در افزایش آلودگی محیط زیست و گرم شدن کره زمین دارد. در این تحقیق جهت تهویه ساختمان و تامین نیازهای آسایش افراد در تابستان، سیستم ایستای صفر انرژی در اقلیم گرم و خشک طراحی شد. این سیستم ترکیبی سرمایشی ایستا(PCHS) شامل دو سیستم متمایز دودکش خورشیدی(SC) و کانال خنک کننده تبخیر ی (ECC) می باشد. هدف این تحقیق استفاده از انرژی های پاک (باد و نور خورشید) است تا علاوه بر تهویه ساختمان؛ مانع تخریب محیط زیست شده و باعث صرفه جویی در انرژی شود.روش بررسی: این تحقیق به صورت تجربی- تحلیلی و شبیه سازی توسط نرم افزار دیزاین بیلدر صورت گرفت و قابلیت سیستم جهت خنک سازی ساختمان در مرداد ماه سال 1397 از ساعت 9 صبح تا 3 بعدازظهر در ده روز متوالی در محوطه دانشگاه آزاد اسلامی واحد کرمانشاه مورد آزمایش قرار گرفت. دمای هوا، رطوبت و سرعت جریان هوای محیط، دهانه خروجی کانال خنک کننده تبخیری و دهانه ورودی دودکش خورشیدی اندازه گیری شد.یافته ها: نتایج نشان داد که کانال خنک کننده تبخیری می تواند دمای هوا را به طور متوسط 10 درجه سلسیوس کاهش دهد و رطوبت هوا را 34% افزایش دهد. با توجه به داده های به دست آمده سرعت هوای دودکش خورشیدی با گرم شدن هوا افزایش یافت، بیشترین سرعت هوای ورودی دودکش خورشیدی در ساعت 3 بعداز ظهر به بیشترین مقدار(8/2 متر بر ثانیه) رسید. با توجه به اینکه افزایش سرعت هوای خروجی از بادگیر تا 41/0 متر بر ثانیه در ساعت 3 بعدازظهر نسبت به ساعت 9 صبح، معادل با کاهش دمای هوا تا 3/6 درجه سلسیوس است بنابراین اتاقک با استفاده از سیستم هیبرید در ساعت 3 بعدازظهر نیز در شرایط آسایش قرار گرفت.بحث و نتیجه گیری: نتایج به دست آمده نشان می دهد که با استفاده از سیستم ترکیبی ایستای طراحی شده، اتاقک از ساعت 9 صبح تا 3 بعدازظهر در شرایط آسایش قرار می گیرد. محاسبه هزینه ساخت و نصب سیستم ایستای هیبریدی و مقایسه آن با کولر آبی نشان می دهد که سیستم پیشنهادی از زمان مورد استفاده سود آور می باشد و زمان برگشت سرمایه پس از اجرا و راه اندازی سیستم می باشد. با افزایش تعداد افراد از 1 نفر تا 4نفر، اتاقک در ساعت 9 صبح و ظهر در شرایط آسایش قرار دارد ولی در ساعت 3 بعدازظهر اتاق با تعدا 4 نفر خارج از محدوده آسایش قرار می گیرد. پرونده مقاله
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        6 - External and Internal Incompressible Viscous Flows Computation using Taylor Series Expansion and Least Square based Lattice Boltzmann Method
        E. Shayan
        The lattice Boltzmann method (LBM) has recently become an alternative and promising computational fluid dynamics approach for simulating complex fluid flows. Despite its enormous success in many practical applications, the standard LBM is restricted to the lattice unifo چکیده کامل
        The lattice Boltzmann method (LBM) has recently become an alternative and promising computational fluid dynamics approach for simulating complex fluid flows. Despite its enormous success in many practical applications, the standard LBM is restricted to the lattice uniformity in the physical space. This is the main drawback of the standard LBM for flow problems with complex geometry. Several approaches have been developed to remove this drawback of standard LBM. One of these methods is the Taylor series expansion and least squares-based LBM (TLLBM). This method is based on the standard LBM combined with the Taylor series expansion and the least squares approach. The prominent feature of the TLLBM is the fact that the final equation is an explicit form and in essence has no limitation on the mesh structure and lattice model. In the present work, the TLLBM with D2Q9 lattice model is used to simulate 2-D steady incompressible viscous flows (both internal and external) on non-uniform meshes. Four test cases are studied: (i) flow past a circular cylinder with a non-uniform O-type mesh; (ii) flow in a rectangular lid driven cavity with a non-uniform H-type mesh; and (iii) flow over a backward- facing step. It was found that this model could give very accurate results for both the internal and external flows. پرونده مقاله
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        7 - تحلیل یک مدولاتور الکترواپتیک بر پایه کاواک نانو پرتو بلور فوتونی تک‌بعدی همراه با ساختار متناوب گرافن بر اکسید آلومینیوم
        مظفرالدین فردوسیان طهرانی رحیم غیور مریم محیط پور
        در این مقاله، ما یک مدولاتور الکترو - اپتیک بر اساس جذب گرافن ارائه می‌کنیم. در این ساختار، گرافن بر روی اکسید آلومینیوم قرار گرفته که ساختار به صورت متناوب تکرار می‌شود. این ساختار متناوب گرافن بر اکسید آلومینیوم در داخل یک حفره نیم‌استوانه‌ای، درون یک کاواک نانو پرتو چکیده کامل
        در این مقاله، ما یک مدولاتور الکترو - اپتیک بر اساس جذب گرافن ارائه می‌کنیم. در این ساختار، گرافن بر روی اکسید آلومینیوم قرار گرفته که ساختار به صورت متناوب تکرار می‌شود. این ساختار متناوب گرافن بر اکسید آلومینیوم در داخل یک حفره نیم‌استوانه‌ای، درون یک کاواک نانو پرتو بلور فوتونی یک بعدی قرار گرفته است. برخلاف مقالات قبلی که کاواک نانو پرتو بلور فوتونی یک بعدی شامل حفره‌های استوانه‌ای بوده و نواحی مختلف با تغییر شعاع این حفره‌ها ایجاد می‌شد، در این ساختار از حفره‌های نیمه استوانه‌ای استفاده شده و با چرخش این نیم‌استوانه‌ها، نواحی مختلف ساختار کاواک نانو پرتو بلور فوتونی ایجاد می‌شود. این نوع بلور فوتونی دارای ضریب کیفیت بالایی است. همچنین این نوع مدولاتورها پس از ساخت به فضای کمی نیاز دارند، بنابراین گزینه بسیار مناسبی برای مدارهای مجتمع هستند. در این مقاله از روش دامنه محدود در حوزه زمان - سه‌بعدی برای تحلیل استفاده شده است. در این مدولاتور مشاهده می‌شود که با تغییر ولتاژ بایاس میزان پیک جذب و همچنین طول موج رزونانس آن تغییر می‎کند. در نتیجه این تغییرات، به عمق مدولاسیونی در حدود ۷ دسی‌بل دست می‌یابیم. ساختار پیشنهادی ما می‌تواند کاربردهای بالقوه‌ای در مدارهای مجتمع نوری، به‌ویژه در فرکانس‌های مخابراتی داشته باشد. پرونده مقاله
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        8 - Effects of Slip Boundaries on Mixed Convection of Al2O3-water Nanofluid in Microcavity
        A. R. Rahmati T. Azizi S. H. Mousavi A. Zarareh
        Due to the importance of the slip effect on modeling of microchannel and microcavity, numerical investigations have been introduced in this work for studying the mixed convection of Al2O3-water nanofluid in a square microcavity. Governing equations are discretized and s چکیده کامل
        Due to the importance of the slip effect on modeling of microchannel and microcavity, numerical investigations have been introduced in this work for studying the mixed convection of Al2O3-water nanofluid in a square microcavity. Governing equations are discretized and solved using the Finite Volume Method and SIMPLER algorithm. The Knudsen number is selected between 0.001 and 0.1 to consider slip velocity and the temperature jump boundary conditions in slip flow regime. In this study we investigate the influence of the Knudsen number on the average Nusselt number and heat transfer rate of Al2O3-water nanofluid. Results shows that the average Nusselt number is the function of Richardson number, Knudsen number and volume fraction of nanoparticles. Increasing the Richardson number, makes the forced convection less effective and leads in reduction of the Nusselt number. Hence, increasing the Knudsen number, leads to the temperature gradient reduction and reducing the average Nusselt number. As a result, the average Nusselt number could be enhanced up to 10.93% by using nanoparticles in the base fluid. پرونده مقاله
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        9 - Investigation of Stress State of the Layered Composite with a Longitudinal Cylindrical Cavity
        V. Yu Miroshnikov
        The article presents the study of the stress state of a two-layer composite with a cylindrical cavity located parallel to the surfaces of the layers. Displacements are set on the cavity and the upper and lower boundaries of the upper and lower layers, respectively. The چکیده کامل
        The article presents the study of the stress state of a two-layer composite with a cylindrical cavity located parallel to the surfaces of the layers. Displacements are set on the cavity and the upper and lower boundaries of the upper and lower layers, respectively. The three-dimensional elasticity solution has been obtained by the analytical-numerical generalized Fourier method with respect to the system of Lame equations in local cylindrical coordinates associated with cavity and Cartesian coordinates associated with boundaries of the layers. The infinite systems of linear algebraic equations resulting from satisfying the boundary conditions are solved by the reduction method. As a result, displacements and stresses have been obtained at various points of the elastic body. We have compared the stress-strain state of a two-layer structure with a cylindrical cavity located in either of the layers. The analysis included various geometrical parameters and boundary functions; the results obtained were compared with a single-layer holed structure. پرونده مقاله
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        10 - Resistivity surveys application for detection of shallow caves in a case example from Western Iraq
        Ali Abed Kamal Ali Asama Al-Hadithy
        The 2-D and 3-D imaging resistivity techniques were used in the current study to determine the shallow subsurface caves in the Haditha region, western Iraq. The 2-D resistivity imaging has been applied at five locations. The dipole-dipole arrangement was selected with a چکیده کامل
        The 2-D and 3-D imaging resistivity techniques were used in the current study to determine the shallow subsurface caves in the Haditha region, western Iraq. The 2-D resistivity imaging has been applied at five locations. The dipole-dipole arrangement was selected with an electrode spacing of 2 m. The inverted models show the anomalous resistivity variation between the background rocks and the voids. Which showed shallow cavities at 1 to 6 m depth, whereas some of them are extending to a depth of 23 m. The unconformity layer between Anah and Euphrates formations is the lowest cohesive than the rocks beneath and above it. Providing the best area for the caves to be formed resulted from dissolving its rocks by leaking rainwater and groundwater. The 3-D resistivity imaging technique was selected near some visible caves by collating seven 2D imaging lines in mapping the subsurface extent of such cavities. 3D imaging draws a sub-surface image in presence of 3D inhomogeneity such as caves. The horizontal slices of 3D models show up these caves with anomalous high resistivity at 0-0.80 m, 0.80-1.72 m, 1.72-2.78 m, and 2.78-3.99 m depths. It also shows a group of small caves, such as the sink-hole canals that connect the main cave to the surface. Both 2-D and 3-D resistivity models have marked a very similar spread of subsurface caves in the study area and show some caves, in the upper part of the unconformity layer. The large values of RMS error for models, attributed to the presence of large homogeneities in the study area. Such heterogeneities are mainly caused by a large variation in the subsurface resistivity of the rocks surrounding the caves and the large spread of shallow caves. پرونده مقاله
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        11 - An all optical photonic crystal based FSK demodulator suitable for optical communications
        akram asghari govar
        Optical frequency shift keying demodulator is an optical structure that can generate logic 0 and 1 codes based on the frequency of the input signal. In this paper we proposed and designed a new structure for realizing frequency shift keying demodulator based on photonic چکیده کامل
        Optical frequency shift keying demodulator is an optical structure that can generate logic 0 and 1 codes based on the frequency of the input signal. In this paper we proposed and designed a new structure for realizing frequency shift keying demodulator based on photonic crystals. The propose structure was designed using resonant cavities. The simulation results show that by setting the frequency of the input signal at 191 THz and 192.3 THz the proposed structure can generate log 0 and 1 bits. The rise time of the proposed structure is about 2 ps. Keywords: Optical Communications, Photonic crystal, FSK demodulator, Resonant cavity. پرونده مقاله
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        12 - Novel Circularly Polarized Substrate Integrated Waveguide Slot Antenna By Using A Polarizer Technique
        Omid Khodadad Pejman Mohammadi
        circularly-polarized antenna is built based on new SIW(substrate integrated waveguide)structure which contains cavity-backed resonator and a conventional polarized ring with twosquare slits in inner and outer ring that differ 90° at position and is proposed for righ چکیده کامل
        circularly-polarized antenna is built based on new SIW(substrate integrated waveguide)structure which contains cavity-backed resonator and a conventional polarized ring with twosquare slits in inner and outer ring that differ 90° at position and is proposed for right-handedcircular polarization (RHCP) and fabricated in two separate layers. A broadband impedancebandwidth of 13.9% and a RHCP axial ratio of 0.5GHz have been obtained under thecondition of less than VSWR ≤2 and axial ratio≤ 3 dB, respectively. پرونده مقاله
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        13 - The effect of cells' radius on optical filter output spectrum based on photonic crystals
        Jabraeil Farajzadeh Mir Mansur Ziabari
        In this article, the effect of cells' radius on the behavior of wavelength switching optical filter andthe effect of the radius of the optical filters' key characteristics such as wavelength resonance onan optical filter based on photonic crystals, have been investigate چکیده کامل
        In this article, the effect of cells' radius on the behavior of wavelength switching optical filter andthe effect of the radius of the optical filters' key characteristics such as wavelength resonance onan optical filter based on photonic crystals, have been investigated. Currently, the most commonapplied mechanism for designing optical filter based on photonic crystals is using twomechanisms such as (a) The resonant cavities and (b) Ring resonators. The applied mechanism inoptical filter used in this article is the resonant cavities. In this filter, filtering act is operated byusing cavity located between output Waveguide and input waveguide and it has been used todesign filter at the first extracted band structure and we have applied forbidden band photonicbased-crystal by using PWE method. Then, the calculations related to filter output spectrum werecarried out by using an FDTD method. Thus, the effect of cells' radius on the behavior ofwavelength switching optical filter has been investigated in this study. پرونده مقاله
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        14 - Reconstruction of Gappy Data for Cavity Flow Using Gappy Proper Orthogonal Decomposition
        Matin Hoseini Nader Montazerin Ghasem Akbari
        The present study examines the possibility of completing gappy flow fields with the method of gappy proper orthogonal decomposition (GPOD). The procedure is performed on a numerically simulated cavity flow. The DNS data is artificially made incomplete by randomly omitti چکیده کامل
        The present study examines the possibility of completing gappy flow fields with the method of gappy proper orthogonal decomposition (GPOD). The procedure is performed on a numerically simulated cavity flow. The DNS data is artificially made incomplete by randomly omitting localized data. Two levels of gappiness are examined to evaluate the GPOD procedure. The results indicate that the relative error between the GPOD estimation and the real field directly depends on the level of gappiness. As the gappiness increases, the prediction accuracy decreases. It is shown that the relative error does not monotonically decrease because of inherent noise in higher-level modes of energy. The optimal count of modes in GPOD procedure is obtained and discussed. The contribution of GPOD procedure on spatial experimental data is also addressed. پرونده مقاله
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        15 - Vortex-induced energy harvesting of an elliptic blade in high-Reynolds lid-driven cavity flow
        Ali Akbar Hosseinjani Ghasem Akbari
        Lid-driven cavity flow is characterized by large-scale energetic eddies which are potential for energy harvesting purposes. The present article deals with numerical study of vortex-induced autorotation of an elliptic blade hinged at the center of a lid-driven cavity.Imm چکیده کامل
        Lid-driven cavity flow is characterized by large-scale energetic eddies which are potential for energy harvesting purposes. The present article deals with numerical study of vortex-induced autorotation of an elliptic blade hinged at the center of a lid-driven cavity.Immersed boundary method is utilized to solve the governing equations for this moving boundary problem. Four different blade dimensions are considered at a fairly high-Reynolds number to evaluate the impact of various vortex types and flow unsteadiness on the blade dynamics. Small-amplitude fluttering, clockwise autorotation and counter-clockwise autorotation are three dominant modes observed at various configurations and different temporal stages. The average-length blade is equally characterized by vortices at both directions, and consequently experiences a fluttering mode. In contrast, short (long) bladeis mainly affected by one dominant vortex type, leading to steady autorotation in counter-clockwise (clockwise) direction. At stable autorotation of blade in both directions, regular cyclic temporal oscillations are observed in the rotational speed, which are due to cyclic evolution of the near-blade vortices and their alternating moment applied to the blade. پرونده مقاله
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        16 - Lattice Boltzmann method for natural convection of nanofluid flow in a trapezoidal-shaped sinusoidal cavity by considering Brownian motion
        Nemat Ebrahimi Hossein Ahmadi Danesh Ashtiani Davood Toghraie
        Using the lattice Boltzmann technique, the mixed convection of nanofluid inside an inclined trapezoidal cavity in the presence of a multidirectional magnetic field is investigated. The sides of the trapezoidal hollow are adiabatic, with the upper moveable wall being col چکیده کامل
        Using the lattice Boltzmann technique, the mixed convection of nanofluid inside an inclined trapezoidal cavity in the presence of a multidirectional magnetic field is investigated. The sides of the trapezoidal hollow are adiabatic, with the upper moveable wall being cold and the lower wall being sinusoidally heated. In simulations, the temperature and flow distribution functions are utilized to determine all parameters related to the temperature and flow fields. On the hot wall, the effects of various Rayleigh numbers (Ra = 103, 104, and 105), inclined cavity angles (θ= 0°-90°), volume fractions of nanoparticles (ϕ== 0-3 percent), magnetic field intensity (Ha = 0-100), and applied magnetic field angle (= 0°-90°) were studied. According to the research, raising the Rayleigh number enhances heat transfer. Moreover, when all other parameters are held equal, raising the nanoparticle volume fraction enhances the average Nusselt number. Increasing the Hartmann number reduces the flow velocity inside the cavity, hence reducing heat transmission. Changes in the cavity's slope and the angle of the applied magnetic field have an effect on the flow and heat transfer as well. پرونده مقاله