Efek Longitudinal Vortex Dihasilkan dari Vortex Generator Jenis Concave Delta dan Rectangular Winglet terhadap Perbaikan Perpindahan Panas: Visualisasi Aliran/Studi Eksperimental
DOI:
https://doi.org/10.21776/ub.jrm.2017.008.03.7Keywords:
longitudinal vortex, concave delta winglet, concave rectangular winglet, convection coefficient, flow visualizationAbstract
The generation of longitudinal vortex to enhance the rate of heat transfer is a passive method that has been widely considered recently. This consideration is based on improving the energy efficiency and optimum design of a heat exchanger. Therefore, this study is focused on the experimental test and flow visualization of effects of longitudinal vortex generated from concave delta and rectangular winglet vortex generators on the increase of heat transfer rate. This is performed by draining the air inside the channel with variations in velocities ranging from 0.4 m/s - 2 m/s through a rectangular plate mounted with the vortex generators. The attack angle of the flow against the vortex generator is 15°. The flow visualization is performed by firing a laser beam on a cylindrical glass rod at certain locations to capture the longitudinal vortex formed on the cross-section plane. Inlet and outlet air temperatures and wall temperature are measured using the thermocouples. The results show that the longitudinal vortices are formed in the wake region of the vortex generators. By using the concave delta winglet, the heat transfer rate can be increased up to 51% and increased to 85% using the concave rectangular winglet.References
M. Fiebig, A. Valencia and N. K. Mitra, 1993, Wing-Type Vortex Generators for Fin-and-Tube Heat Exchangers, Experimental Thermal and Fluid Science, Vol. 7, pp. 287-295.
J. X. Zhu, M. Fiebig and N. K. Mitra, 1995, Numerical investigation of turbulent flows and heat transfer in a rib-roughened channel with longitudinal vortex generators, lnternational Journal Heat and Mass Transfer, Vol. 38, No. 3, pp. 495-501.
A. M. Jacobi and R. K. Shah, 1995, Heat Transfer Surface Enhancement through the Use of Longitudinal Vortices: A Review of Recent Progress, Experimental Thermal and Fluid Science, Vol. 11, pp. 295-309
Martin Fiebig, 1995, Embedded vortices in internal flow: heat transfer and pressure loss enhancement, Internatiional Journal Heat and Fluid Flow, Vol.16, pp. 376-388
J.M. Wu and W.Q. Tao, 2008, Numerical study on laminar convection heat transfer in a rectangular channel with longitudinal vortex generator.Part A: Veriï¬cation of ï¬eld synergy principle, International Journal of Heat and Mass Transfer, Vol. 51, pp. 1179–1191.
J.M. Wu and W.Q. Tao, 2008, Numerical study on laminar convection heat transfer in a channel with longitudinal vortex generator. Part B: Parametric study of major influence factors, International Journal of Heat and Mass Transfer, Vol. 51, pp. 3683–3692.
A. Joardar and A.M. Jacobi, 2008, Heat transfer enhancement by winglet-type vortex generator arrays in compact plain-ï¬n-and-tube heat exchangers, International Journal of Refrigeration, Vol. 31, pp.87–97.
Chunhua Min, Chengying Qi, Xiangfei Kong and Jiangfeng Dong, 2010, Experimental study of rectangular channel with modiï¬ed rectangular longitudinal vortex generators, International Journal of Heat and Mass Transfer, Vol. 53, pp.3023–3029.
M.S. Aris, R. McGlen,I.Owen and C.J. Sutcliffe, 2011, An experimental investigation into the deployment of 3-D, ï¬nned wing and shape memory alloy vortex generators in a forced air convection heat pipe ï¬n stack, Applied Thermal Engineering, Vol. 31, pp. 2230-2240.
J.M. Wu and W.Q. Tao, 2012, Effect of longitudinal vortex generator on heat transfer in rectangular channels, Applied Thermal Engineering, Vol. 37, pp. 67-72.
Ya-Ling He, Pan Chu, Wen-Quan Tao, Yu-Wen Zhang dan Tao Xie, 2013, Analysis of heat transfer and pressure drop for ï¬n-and-tube heat exchangers with rectangular winglet-type vortex generators, Applied Thermal Engineering, Vol. 61, pp. 770-783.
Rahmat Purnomojati dan Syaiful, 2014, Efek Orientasi Sudut Rectangular-Winglet Vortex generator Terhadap Performa Termal dan Hidrodinamik Penukar Kalor Jenis Fin-Tube dengan Susunan Pipa Sejajar, Proceeding Seminar Nasional Tahunan Teknik Mesin XIII (SNTTM XIII), Depok, 15 – 16 Oktober 2014
Guobing Zhou dan Zhizheng Feng, 2014, Experimental investigations of heat transfer enhancement by plane and curved winglet type vortex generators with punched holes, International Journal of Thermal Sciences, Vol. 78, pp. 26-35.
Syaiful, Rochman Jalil, Imam Hambali dan Myung-whan Bae, 2015, Numerical Simulation of Concave Delta Winglet Vortex Generator Effect on Heat Transfer Augmentation in Airflow inside A Channel, Proceedings of the Seventh International Symposium on Mechanics, Aerospace and Informatics Engineering, Jinju, Korea, September 17 ∼ 19, 2015.
M. Khoshvaght-Aliabadi, O. Sartipzadeh dan A. Alizadeh, 2015, An experimental study on vortex-generator insert with different arrangements of delta-winglets, Energy, Vol. 82, pp. 629-639.
Syaiful, Geny Reviansyah dan Myung-whan Bae, 2016, Attack Angle Effect of Concave Delta Winglet Vortex Generator on Heat Transfer Augmentation in Fin-and-Tube Heat Exchanger for EGR Cooler Application by Numerical Simulation, FISITA 2016 World Automotive Congress, 26-30 September 2016, Busan, Korea.
Babak Lotï¬, Bengt Sundén dan Qiuwang Wang, 2016, An investigation of the thermo-hydraulic performance of the smooth wavy ï¬n-and-elliptical tube heat exchangers utilizing new type vortex generators, Applied Energy, Vol. 162, pp. 1282–1302.
Hung-Yi Li, Wan-Rong Liao, Tian-Yang Li dan Yan-Zuo Chang, 2017, Application of vortex generators to heat transfer enhancement of a pin-ï¬n heat sink, International Journal of Heat and Mass Transfer, Vol. 112, pp.940–949.
Syaiful, Gladys Sugiri, Maria F. Soetanto dan Myung-whan Bae, 2017, Effect of concave rectangular winglet vortex generator on convection coefficient of heat transfer, American Institute of Physics, 1788.
KeWei Song dan LiangBi Wang, 2016, Effects of longitudinal vortex interaction on periodically developed flow and heat transfer of ï¬n-and-tube heat exchanger, International Journal of Thermal Sciences, Vol. 109, pp.206-216.
Vinicius Malatesta, Leandro F. Souza, Joseph T. C. Liu dan Markus J.Kloker, 2015, Heat transfer analysis inaflow over concave wall with primary and secondary instabilities, Procedia IUTAM, Vol.14, pp.487 – 495.
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