Entropy Generation, Heat Transfer of Water Near Density Inversion Region with Relative Positions of Hot and Cold Walls: Numerical Analysis
DOI:
https://doi.org/10.37934/cfdl.15.5.4253Keywords:
natural convection, Density Inversion, Entropy Generation, Numerical SimulationAbstract
This study investigates the entropy generation and heat transfer of water density inversion region in a square cavity with the different relative positions of hot and cold walls by numerical simulation. Mathematical models are solved using the EES (Engineering Equation Solver) program. A physical model is a 38 mm square cavity filled with water, with cold and hot wall temperatures maintained at 0oC and 10oC. Results indicated that the Nusselt number of cases 1 (cold and hot walls on both sides) is higher than case 2 (hot wall above, cold wall below) and case 3 (cold wall above, hot wall below) by 1.582 and 1.059 times, respectively. The average total generation per unit volume in case 1 increases by 1.577 times and 1.059 times, respectively, compared to cases 2 and 3, which almost correspondingly increase with heat transfer capacity. Entropy generation by fluid friction is negligible
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Michalek, Tomasz, Tomasz A. Kowalewski, and Bozidar Sarler. "Natural convection for anomalous density variation of water: numerical benchmark." Progress in Computational Fluid Dynamics, an International Journal 5, no. 3-5 (2005): 158-170. https://doi.org/10.1504/PCFD.2005.006751
Seki, N. "Free convective heat transfer with density inversion in a confined rectangular vessel." (1978). https://doi.org/10.1007/BF01805655
Lin, D. S., and M. W. Nansteel. "Natural convection heat transfer in a square enclosure containing water near its density maximum." International journal of heat and mass transfer 30, no. 11 (1987): 2319-2329. https://doi.org/10.1016/0017-9310(87)90224-9
Hu, Yu-Peng, You-Rong Li, Xiao-Feng Yuan, and Chun-Mei Wu. "Natural convection of cold water near its density maximum in an elliptical enclosure containing a coaxial cylinder." International Journal of Heat and Mass Transfer 60 (2013): 170-179. https://doi.org/10.1016/j.ijheatmasstransfer.2012.12.059
Li, You-Rong, Xiao-Feng Yuan, Chun-Mei Wu, and Yu-Peng Hu. "Natural convection of water near its density maximum between horizontal cylinders." International Journal of Heat and Mass Transfer 54, no. 11-12 (2011): 2550-2559. https://doi.org/10.1016/j.ijheatmasstransfer.2011.02.006
Sivasankaran, S. "Natural convection of cold water near its density maximum in a porous wavy cavity." Flow and Transport in Subsurface Environment (2018): 305-324. https://doi.org/10.1007/978-981-10-8773-8_10
Hossain, Md Anwar, and DA S. Rees. "Natural convection flow of water near its density maximum in a rectangular enclosure having isothermal walls with heat generation." Heat and mass transfer 41 (2005): 367-374. https://doi.org/10.1007/s00231-004-0551-3
Luan, Nguyen Thanh, and Nguyen Minh Ha. "Nghiên cứu đánh giá ảnh hưởng của thông số hình học và dòng chảy đến hiệu suất exergy của thiết bị trao đổi nhiệt ống lồng ống dạng xoắn bằng phương pháp mô phỏng CFD." Journal of Technical Education Science 63 (2021): 71-82. https://doi.org/10.54644/jte.63.2021.71
Thanh Luan, Nguyen, and Nguyen Minh Phu. "Thermohydraulic Performance and Entropy Generation of Baffled Channel: Numerical Analysis and Optimization." Journal of Thermophysics and Heat Transfer 36, no. 2 (2022): 303-313. https://doi.org/10.2514/1.T6332
Phu, Nguyen Minh, and Nguyen Van Hap. "Numerical Investigation of Natural Convection and Entropy Generation of Water near Density Inversion in a Cavity Having Circular and Elliptical Body." Computational Overview of Fluid Structure Interaction (2020): 121. https://doi.org//10.5772/intechopen.95301.
Kashani, Sina, A. A. Ranjbar, Mohammad Mastiani, and Hooshyar Mirzaei. "Entropy generation and natural convection of nanoparticle-water mixture (nanofluid) near water density inversion in an enclosure with various patterns of vertical wavy walls." Applied Mathematics and Computation 226 (2014): 180-193. https://doi.org/10.1016/j.amc.2013.10.054
Mahmoudi, Ahmed, Imen Mejri, Mohamed Ammar Abbassi, and Ahmed Omri. "Analysis of the entropy generation in a nanofluid-filled cavity in the presence of magnetic field and uniform heat generation/absorption." Journal of Molecular Liquids 198 (2014): 63-77. https://doi.org/10.1016/j.molliq.2014.07.010
Mirzaee, Mahshid, and Esmail Lakzian. "Entropy generation analysis of eccentric cylinders pair sources on nanofluid natural convection with non-Boussinesq state." Advanced Powder Technology 28, no. 12 (2017): 3172-3183. https://doi.org/10.1016/j.apt.2017.09.034
Kianpour, Ehsan, Nor Azwadi Che Sidik, Seyyed Muhammad Hossein Razavi Dehkordi, and Siti Nurul Akmal Yusof. "Numerical Simulation of Steady and Unsteady Flow and Entropy Generation by Nanofluid Within a Sinusoidal Channel." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 89, no. 2 (2022): 25-42. https://doi.org/10.37934/arfmts.89.2.2542
Hussein, Ahmed Kadhim, Muhaiman Alawi Mahdi, and Obai Younis. "Numerical simulation of entropy generation of conjugate heat transfer in a porous cavity with finite walls and localized heat source." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 84, no. 2 (2021): 116-151. https://doi.org/10.37934/arfmts.84.2.116151
Sidik, Nor Azwadi Che, Wan Mohd Arif Aziz Japar, and Yutaka Asako. "Entropy generation minimization in sinusoidal cavities-ribs microchannel heat sink via secondary channel geometry." CFD Letters 11, no. 7 (2019): 1-10.
Cengel, Y., and Transfer Mass Heat. "A practical approach." Heat and Mass Transfer (2003).
Klein, Sanford A., and F. Alvarado. "Engineering equation solver software (EES)." F-Chart Software: Madison, WI, USA (2013).
Bouafia, Islam, Razli Mehdaoui, Syham Kadri, and Mohammed Elmir. "Conjugate natural convection in a square porous cavity filled with a nanofluid in the presence of two isothermal cylindrical sources." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 80, no. 1 (2021): 147-164. https://doi.org/10.37934/arfmts.80.1.147164
