فهرس المقالات Temperature gradient

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  1 - Role of dust on the gradient driven instability in an E×B plasma
  Munish Munish Dimple Sharma Babu Lal Sukhmander Singh
  10.57647/J.JTAP.2023.1704.43
  The E*B plasma systems play an important role in the technologies like electric space propulsion and magnetized plasma sources used in plasma material interaction / surface processing. However, due to the gradient in plasma density, collisions and external fields such s أکثر

  The E*B plasma systems play an important role in the technologies like electric space propulsion and magnetized plasma sources used in plasma material interaction / surface processing. However, due to the gradient in plasma density, collisions and external fields such systems become prone to the instabilities and also dust particles are generated during the plasma processing. Hence, this article discusses the growth of gradient driven instability in a cross-field plasma, where both the ions and the electrons are magnetized and dust particles also exist. Using the fluid approach, we write basic equations and then derive an equation in terms of perturbed potential. The unperturbed part of this equation leads to the dispersion equation which is solved numerically for obtaining the growth rate of the instability. The normalized form of the growth rate is investigated in greater detail under the effect of dust density, dust mass, dust temperature, external magnetic field, ion temperature and ion temperature gradient. تفاصيل المقالة
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  2 - ساخت و شبیه سازی سیستم بازیافت انرژی خورشیدی با استفاده از فناوری ترموالکتریک
  محمد صائمیان نادر رهبر
  این پژوهش، سیستم بازیافت انرژی خورشیدی را که از سه بخش اصلی شامل یک ترموالکتریک ژنراتور، یک عدسی محدب و یک هیتسینک حرارتی تشکیل شده را ارائه می نماید. مهمترین ویژگی سیستم بازیافت ارائه شده، ساختار و طراحی ساده، بدون پیچدگی و قیمت مناسب آن می باشد که در طراحی سیستم بازیا أکثر

  این پژوهش، سیستم بازیافت انرژی خورشیدی را که از سه بخش اصلی شامل یک ترموالکتریک ژنراتور، یک عدسی محدب و یک هیتسینک حرارتی تشکیل شده را ارائه می نماید. مهمترین ویژگی سیستم بازیافت ارائه شده، ساختار و طراحی ساده، بدون پیچدگی و قیمت مناسب آن می باشد که در طراحی سیستم بازیافت، یک سمت ترموالکتریک توسط انرژی خورشید گرم و سمت دیگر ترموالکتریک توسط هیتسینک که در معرض آب یک رودخانه قرار دارد، خنک می شود. گرادیان دما در دو سمت ترموالکتریک ایجاد شده که این امر بازیافت انرژی خورشیدی، در نتیجه ولتاژ و توان الکتریکی را به همراه خواهد داشت. برای ارزیابی سیستم ارائه شده در جهت بازیافت انرژی خورشیدی، پس از ساخت آن، تمامی داده ها و پارامترهای اثرگذار در دو سمت ترموالکتریک ژنراتور در حین آزمایش در هر ده دقیقه ثبت شده و سپس سیستم بازیافت و اطلاعات ثبت شده در نرم افزار حلگر معادلات مهندسی به صورت کد، شبیه سازی شده اند. بر اساس آزمایش های عملی ماکزیمم ولتاژ خروجی مدار بازیافت در اختلاف دمای 25 درجه سانتی گراد، 229 میلی ولت گزارش شده است. تفاصيل المقالة
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  3 - Empirical and Numerical Study of Gas Turbine Disks under Mechanical Stress and Temperature Gradient
  Rasoul Yari Yari Hamid Zarepour Aazam Ghassemi
  Gas turbine disks usually operate at very high temperatures and rotate at very high angular velocities under normal working conditions. High temperature in turbine disks causes changes in their properties. High angular velocity creates a large centrifugal force in the d أکثر

  Gas turbine disks usually operate at very high temperatures and rotate at very high angular velocities under normal working conditions. High temperature in turbine disks causes changes in their properties. High angular velocity creates a large centrifugal force in the disk and high temperature reduces the strength of the material and causes deformation. Complexity of these parameters has turned the determination of stress distribution in gas turbine disks to one of the bottlenecks in the analysis, design and manufacturing of turbine engines. Therefore, using an applicable method for stress analysis is essential in order to better determine stress distribution in turbine disks. In this study, the finite element method (FEA) is used for predicting the behavior of rotating disks under mechanical and thermal stresses. In order to increase the certainty of simulation, gas turbine disk is first simulated and analyzed based on dimensions and loading conditions extracted from previous studies. Then, the results are compared with previous studies in order to determine the accuracy of analysis method applied in ANAQUS software. Afterwards, gas turbine disks are evaluated under both rotational movement and temperature gradient. The results show that the presence of angular velocity and centrifugal force cause expansion to the disk radius. The results show an acceptable correlation between the results of empirical and numerical studies. According to the results, the approach proposed in this study is a suitable method for analysis of the stress, temperature and displacement in turbine disks and other components with similar functions. تفاصيل المقالة
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  4 - Investigation of Effective Parameters on the Surface Temperature Gradient under Equal Channel Angular Pressing Process of AA2017
  Farshid Ahmadi Hadi Mansouri Elyas Sarami Foroushani
  In recent years, processes known as severe plastic deformation (SPD) have been devised to create fine-grained materials. Among these processes, equal channel angular pressing (ECAP) has been more favored than other methods due to its high efficiency, simplicity, and ind أکثر

  In recent years, processes known as severe plastic deformation (SPD) have been devised to create fine-grained materials. Among these processes, equal channel angular pressing (ECAP) has been more favored than other methods due to its high efficiency, simplicity, and industrial production potential. This study aimed to investigate the sample temperature gradient during the ECAP process. For this purpose, a Taguchi experiment with influencing factors on AA2017 alloy was designed and a relationship was obtained to predict sample surface temperature. Experiments were carried out using grease, graphite powder, and MoS2 lubricants, along with routes A, BC, BA, and C. The surface temperature of the sample was measured using a laser thermometer. A finite element model was compared with the experimental conditions, and the simulation and experimental results of surface temperature were verified with an error of about 1.9%. In experiments, it was found that speed and lubricant had a significant effect on sample temperature during the process. The simulation results showed that decreasing the die angle resulted in a significant increase in temperature. Following the validation of the FEM model, the temperature gradient and distribution in the middle of the sample, wherein practical experiments could not be measured, were also investigated. تفاصيل المقالة