Experimental study of friction factors of multi-walled carbon nanotubes/water flow inside helical double-pipe heat exchangers
محورهای موضوعی :
Application of Textile Products in other Sciences and Disciplines
Farzad Fathian
1
,
Seyed Ali Agha Mirjalily
2
,
Mohammad Reza Salimpour
3
,
Seyed Amir Abbas Oloomi
4
1 - Department of Mechanical Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
2 - Department of Mechanical Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
3 - Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran.
4 - Department of Mechanical Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran.
تاریخ دریافت : 1399/12/20
تاریخ پذیرش : 1401/02/27
تاریخ انتشار : 1401/04/01
کلید واژه:
friction factor,
Nanofluid,
Multi-Walled Carbon Nanotube,
Helical Annuli,
PEC,
چکیده مقاله :
This study presents the findings of experiments on the impact of multi-walled carbon nanotubes on the pressure drop of the flow in helical annuli. The exterior of the heat exchanger is insulated. The nanofluid travels through the annulus as hot water flows through the inner helical tube. Two double-pipe cases are produced, each with a different curvature ratio. Several experiments are conducted to assess the effect of the coiled annuli geometry on the flow pressure drop. Additionally, the effects of the Dean Number and nanotube concentration are examined. The results indicated that the friction factors related to the nanofluid flow are higher than those of water, but our previous study demonstrated that they have superior heat transfer coefficients. Therefore, the performance evaluation criteria are achieved. In all the cases, they are higher than unity showing the superiority of this kind of heat exchanger.
چکیده انگلیسی:
This study presents the findings of experiments on the impact of multi-walled carbon nanotubes on the pressure drop of the flow in helical annuli. The exterior of the heat exchanger is insulated. The nanofluid travels through the annulus as hot water flows through the inner helical tube. Two double-pipe cases are produced, each with a different curvature ratio. Several experiments are conducted to assess the effect of the coiled annuli geometry on the flow pressure drop. Additionally, the effects of the Dean Number and nanotube concentration are examined. The results indicated that the friction factors related to the nanofluid flow are higher than those of water, but our previous study demonstrated that they have superior heat transfer coefficients. Therefore, the performance evaluation criteria are achieved. In all the cases, they are higher than unity showing the superiority of this kind of heat exchanger.
منابع و مأخذ:
Vashisth, Kumar, V. and K.D. Nigam, "A review on the potential applications of curved geometries in process industry" Industrial & Engineering Chemistry Research., vol. 47, no. 10, pp. 3291-3337, 2008.
Prabhanjan, G. Raghavan, and T. Rennie, "Comparison of heat transfer rates between a straight tube heat exchanger and a helically coiled heat exchanger" International Communications in Heat and Mass Transfer., vol. 29, no. 2, pp. 185-191, 2002.
Salimpour, "Heat transfer characteristics of a temperature-dependent-property fluid in shell and coiled tube heat exchangers" International Communications in Heat and Mass Transfer, vol. 35, no. 9, pp. 1190-1195, 2008.
Salimpour, "Heat transfer coefficients of shell and coiled tube heat exchangers", Experimental thermal and fluid science, vol. 33, no. 2, pp. 203-207, 2009.
Shokouhmand, M. Salimpour, and M. Akhavan-Behabadi, "Experimental investigation of shell and coiled tube heat exchangers using Wilson plots", International Communications in Heat and Mass Transfer, vol. 35, no. 1, pp. 84-92, 2008.
Cioncolini, and L. Santini, "An experimental investigation regarding the laminar to turbulent flow transition in helically coiled pipes", Experimental Thermal and Fluid Science, vol. 30, no. 4, pp. 367-380, 2006.
Jayakumar, et al., "Experimental and CFD estimation of heat transfer in helically coiled heat exchangers", Chemical engineering research and design, vol. 86, no. 3, pp. 221-232, 2008.
Choi, "Enhancing thermal conductivity of fluids with nanoparticles", ASME-Publications-Fed, vol. 231, pp. 99-106, 1995.
A. Eastman, , et al., "Thermal transport in nanofluids 1", Annu. Rev. Mater. Res., vol. 34, pp. 219-246, 2004.
Xuan, and Q. Li, "Heat transfer enhancement of nanofluids", International Journal of heat and fluid flow, vol. 21, no. 1, pp. 58-64, 2000.
Yu, and H. Xie, "A review on nanofluids: preparation, stability mechanisms, and applications", Journal of Nanomaterials, vol. 2012, pp. 1, 2012.
Akhavan-Behabadi, M.F. Pakdaman, and M. Ghazvini, "Experimental investigation on the convective heat transfer of nanofluid flow inside vertical helically coiled tubes under uniform wall temperature condition", International Communications in Heat and Mass Transfer, vol. 39, no. 4, pp. 556-564, 2012.
Hashemi, and M. Akhavan-Behabadi, "An empirical study on heat transfer and pressure drop characteristics of CuO–base oil nanofluid flow in a horizontal helically coiled tube under constant heat flux", International Communications in Heat and Mass Transfer, vol. 39, no. 1, pp. 144-151, 2012.
Kahani, S.Z. Heris, and S.M. Mousavi, "Comparative study between metal oxide nanopowders on thermal characteristics of nanofluid flow through helical coils", Powder technology, vol. 246, pp. 82-92, 2013.
Shahsavar, M. Saghafian, M. R. Salimpour, and M. B. Shafii, "Effect of temperature and concentration on thermal conductivity and viscosity of ferrofluid loaded with carbon nanotubes", Heat and Mass Transfer, vol. 52, pp. 2293-2301, 2016.
J. Assael, C.-F. Chen, I. Metaxa, and W. A. Wakeham, "Thermal Conductivity of Suspensions of Carbon Nanotubes in Water", International Journal of Thermophysics, vol. 25, no. 4, pp. 971-985, 2004.
J. Assael, I. N. Metaxa, J. Arvanitidis, D. Christofilos, and C. Lioutas, "Thermal Conductivity Enhancement in Aqueous Suspensions of Carbon Multi-Walled and Double-Walled Nanotubes in the Presence of Two Different Dispersants", International Journal of Thermophysics, vol. 26, no. 3, pp. 647-664, 2005.
Ding, H. Alias, D. Wen, and R.A. Williams, "Heat Transfer of Aqueous Suspensions of Carbon Nanotubes (CNT Nanofluids)", International Journal of Heat and Mass Transfer, vol. 49, no. 1, pp. 240-250, 2006.
Indhuja, K.S. Suganthi, S. Manikandan, and K.S. Rajan, "Viscosity and Thermal Conductivity of Dispersions of Gum Arabic Capped Mwcnt in Water: Influence of Mwcnt Concentration and Temperature", Journal of the Taiwan Institute of Chemical Engineers, vol. 44, no. 3, pp. 474-479, 2013.
