An Investigation of the Effect of Vortex Generators on Heat Transfer in Channel Flow

Year 2018, Volume: 2 Issue: 2, 1 - 9, 15.12.2018

Muammer Zırzakıran Sinan Çalışkan

Abstract

In this experimental study, we investigated the influence of the winglet, heat transfer, and pressure drop on the vortex flow to create a vortex in a stream of air sent to a fixed channel through a fan. Three parameters were determined as the winglets parameters: angle, height of the winglet, and arrangement in the channel of the winglet. The three winglet placed in the channel have the same angle and the same base height. Its experimental setup was applied for four different Reynolds numbers. The Nusselt number obtained from the smooth channel was compared with the correlations in the literature. Heat transfer results were obtained using thermal imaging technique. The heat transfer data obtained for all the specified test cases were compared with the smooth channel data. While comparing the Nusselt numbers and thermal camera images obtained from the experiments, the increases in heat transfer of the wing types have been examined and discussed.

Keywords

Heat transfer, Vortex generator, winglet

References

• [1] Hemmat Esfe M, Abbasian Arani AA, Niroumand AH, Yan W-M, Karimipour A. Mixed convection heat transfer from surfa-ce-mounted block heat sources in a horizontal channel with nanofluids. International Journal of Heat and Mass Transfer (2015) 89:783–791. doi:10.1016/j.ijheatmasstransfer.2015.05.100.
• [2] Tanda G. Effect of rib spacing on heat transfer and friction in a rectangular channel with 45° angled rib turbulators on one/two walls. International Journal of Heat and Mass Transfer (2011) 54(5-6):1081–1090. doi:10.1016/j.ijheatmasstransfer.2010.11.015.
• [3] Alamgholilou A, Esmaeilzadeh E. Experimental investigation on hydrodynamics and heat transfer of fluid flow into channel for cooling of rectangular ribs by passive and EHD active en-hancement methods. Experimental Thermal and Fluid Science (2012) 38:61–73. doi:10.1016/j.expthermflusci.2011.11.008.
• [4] Chatterjee D. Triggering vortex shedding by superimposed thermal Buoyancy around bluff obstacles in cross-flow at low Reynolds numbers. Numerical Heat Transfer Applied (2012) 61:800–806.
• [5] Agrawal S, Simon TW, North M, Bissell D, Cui T. Heat transfer augmentation of a channel flow by active agitation and surface mounted cylindrical pin fins. International Journal of Heat and Mass Transfer (2015) 87:557–567. doi:10.1016/j.ijheatmasstransfer.2015.04.036.
• [6] Dogan A, Sivrioglu M, Baskaya S. Investigation of mixed con-vection heat transfer in a horizontal channel with discrete heat sources at the top and at the bottom. International Journal of Heat and Mass Transfer (2006) 49(15-16):2652–2662. doi:10.1016/j.ijheatmasstransfer.2006.01.005.
• [7] Gül H, Evin D, Tanyıldızı V. Experimantally investigation of the effect of a square cross-sectional obstacle located in a channel on heat transfer. Journal of Engineering and Natural Sciences, Sigma (2006) 3.
• [8] Meinders ER, Hanjalic K. Experimental heat transfer from in-line and staggered configurations of two wall-mounted cubes. International Journal of Heat and Mass Transfer (2002) 45:465–482.
• [9] Kıvılcım G. Yatay ve Dikdörtgen Kanallarda Akış ve Dik Daire-sel Olmayan Dönel Engellerin Isı Transferine Etkisi [The Effect of Flow and Non-Circular Rotational Obstacles on Heat Trans-fer in Horizontal and Rectangular Channels]. Master Thesis. Sakarya University. Sakarya (2007).
• [10] Xie G, Liu J, M. Ligrani P, Sunden B. Flow structure and heat transfer in a square passage with offset mid-truncated ribs. In-ternational Journal of Heat and Mass Transfer (2014) 71:44–56. doi:10.1016/j.ijheatmasstransfer.2013.12.005.
• [11] Anghel IG, Anglart H. Post-dryout heat transfer to high-pressure water flowing upward in vertical channels with vari-ous flow obstacles. International Journal of Heat and Mass Transfer (2012) 55(25-26):8020–8031. doi:10.1016/j.ijheatmasstransfer.2012.08.036.
• [12] Frohlich J, Rodi W, Kessler P, Parpais S, Bertoglio JP, Lau-rence D. Large eddy simulation of flowaround circu-lar cylin-ders on structured and unstructured grids. Notes on Numerical Fluid Mechanics (1988):319–338.
• [13] Bhadouriya R, Agrawal A, Prabhu SV. Experimental and nu-merical study of fluid flow and heat transfer in a twisted squa-re duct. International Journal of Heat and Mass Transfer (2015) 82:143–158. doi:10.1016/j.ijheatmasstransfer.2014.11.054.
• [14] Ahmed HE, Ahmed MI, Yusoff MZ. Heat transfer enhance-ment in a triangular duct using compound nanofluids and tur-bulators. Applied Thermal Engineering (2015) 91:191–201. doi:10.1016/j.applthermaleng.2015.07.061.
• [15] Gutierrez LD, Guerrero HA, Ortiz LL, Leon CJ. Numerical and experimental analysis of heat transfer enhancement in grooved channel with curved flow deflectors. Applied Thermal Enginee-ring (2015) 75:800–808.
• [16] Gül H, Evin D. Experimental investigation of cross-sectional area effect on characterictics (2006).
• [17] Chang SW, Chiang KF, Chou TC. Heat transfer and pressure drop in hexagonal ducts with surface dimples. Experimental Thermal and Fluid Science (2010) 34(8):1172–1181. doi:10.1016/j.expthermflusci.2010.04.006.
• [18] Chaitanya NSK, Dhiman AK. Non-Newtonian power-law flow and heat transfer across a pair of side-by-side circular cylin-der. International Journal of Heat and Mass Transfer (2012) 55:5941–5958.
• [19] Chen W-L, Gao D-L, Yuan W-Y, Li H, Hu H. Passive jet cont-rol of flow around a circular cylinder. Experiments in Fluids (2015) 56(11):848. doi:10.1007/s00348-015-2077-5.
• [20] Evin D, Tanyıldızı V. The effect of obstacles normal to the flow in a partially bottom heated horizantal channel on a heat transfer. Science and Engineering Journal of Fırat University (2006) 18:249–255.
• [21] Selimefendigil F, Öztop HF. Effect of a rotating cylinder in forced convection of ferrofluid over a backward facing step. International Journal of Heat and Mass Transfer (2014) 71:142–148. doi:10.1016/j.ijheatmasstransfer.2013.12.042.
• [22] Barik AK, Mukherjee A, Patro P. Heat transfer enhancement from a small rectangular channel with different surface prot-rusions by a turbulent cross flow jet. International Journal of Thermal Sciences (2015) 98:32–41. doi:10.1016/j.ijthermalsci.2015.07.003.
• [23] Hussam WK, Sheard J, G. Heat transfer in a high Hartmann number MHD duct flow with a cylinder placed near the heated side-wall. International Journal of Heat and Mass Transfer (2015) 67:944–954.
• [24] Baytaş C, Erdem D, Acar H. Okşan Ç.Y., 2008-2011. An exper-imental and investigation in the composite channel for the boundary conditions at a fluid- solid interface (2011).
• [25] Ling CM, Jin YY, Z.Q C. Heat/Mass Transfer and Pressure Drop in a Triangular-rib-roughened Rectangular Channel, Int. Journal of Heat and Fluid Flow (1994) 15:6–486.
• [26] Huq M, Aziz-ul Huq AM. Experimental Measurements of Heat Transfer in An Internally Finned Tube. International Commu-nications in Heat and Mass Transfer (1998) 25(5):619–630.