NUMERICAL STUDY OF PRESSURE DROP AND HEAT TRANSFER IN A STRAIGHT RECTANGULAR AND SEMI CYLINDRICAL PROJECTIONS MICROCHANNEL HEAT SINK

Abstract

The heat transfer and pressure drop characteristics of a straight rectangular and semi cylindrical projections microchannel heat sink were investigated. The heat sinks, made of copper, were aligned in row as a cluster of 21 microchannels, 231 µm wide and 713 µm deep. Water was used as cooling fluid and was made to flow through the channels. A three dimensional analysis was done for Reynolds number ranging between 200 to 1000 with constant heat flux of 10⁶ W/m² defined relative to the platform area of the heat sink. The temperature rise and pressure drop of the fluid in straight microchannel heat sink was evaluated using ANSYS-CFX package and was validated using experimental data. Similar analysis was done for semi cylindrical projections microchannel heat sink by solving the conjugate heat transfer problem. A comparison of heat transfer and pressure drop between rectangular and semi cylindrical projections microchannel was done and the results were laid out. Results shows that heat transfer increases with the use of semi cylindrical projections microchannel heat sink.

Keywords

• Heat Sink,Microchannel,Heat Transfer,Reynolds Number,Conjugate Heat Transfer,Semi Cylindrical Projections

References

1. [1] D.B. Tuckerman, R.F.W. Pease, “High-performance heat sinking for VLSI”, IEEE Electron. Dev. Lett. EDL-2 (1981) 126–129.
2. [2] X.F. Peng, G.P. Peterson, “Convective heat transfer and flow friction for water flow in microchannel structures”, Int. J. Heat Mass Transfer 39 (1996) 2599–2608.
3. [3] A.G. Fedorov, R. Viskanta, “Three-dimensional conjugate heat transfer in the microchannel heat sink for electronic packaging”, Int. J. Heat Mass Transfer 43 (2000) 399–415.
4. [4] I. Mudawar, W. Qu, “Experimental and numerical study of pressure drop and heat transfer in a single-phase micro-channel heat sink”, Int. J. Heat and Mass Transfer 45(2002) 2549-2565.
5. [5] Dong Liu and Suresh V. Garimella, Investigation of Liquid Flow in Microchannels, Journal of Thermophysics and Heat Transfer, 18(2004) pp.65-72.
6. [6] Sabbah, R., Yagoobi, J., & Hallaj, S. A., Experimental and numerical investigation of heat transfer characteristics of liquid flow with micro-encapsulated phase change material, ASME Summer Heat Transfer Conference, 2 (2008) 495-501.
7. [7] Omar Mokrani, Brahim Bourouga, Cathy Castelain, Hassan Peerhossaini, Fluid flow and convective heat transfer in flat microchannels, Int. J. Heat Mass Transfer 52 (2009) 1337–1352.
8. [8] P. Mohajeri Khameneh et al. A numerical study of single-phase forced convective heat transfer with flow friction in microchannels, International Journal of Engineering 25 (2012) 79-88.

9. [9] Evgeny V. Rebrov, , Jaap C. Schouten, Mart H.J.M. de Croon Single-phase fluid flow distribution and heat transfer in microstructured reactors, Chemical Engineering Science66(2011)1374-1393.
10. [10] Gilles Roy, Cong Tam Nguyen, Paul-René Lajoie, Numerical investigation of laminar flow and heat transfer in a radial flow cooling system with the use of nanofluids, Superlattices and Microstructures 35 (2004) 497–511.
11. [11] Lei Chai, Guo Dong Xia, Hua Sheng Wang, Laminar flow and heat transfer characteristics of interrupted microchannel heat sink with ribs in the transverse microchambers, International Journal of Thermal Sciences 110 (2016) 1-11.
12. [12] Assel Sakanova, Chan Chun Keian, Jiyun Zhao, Performance improvements of microchannel heat sink using wavy channel and nanofluids, International Journal of Heat and Mass Transfer 89 (2015) 59–74.
13. [13] Minghai Xu, Hui Lu, Liang Gong, John C. Chai, Xinyue Duan, Parametric numerical study of the flow and heat transfer in microchannel with dimples, International Communications in Heat and Mass Transfer 76 (2016) 348–357 .
14. [14] Hongtao Wang, Zhihua Chen, Jianguo Gao, Influence of geometric parameters on flow and heat transfer performance of micro-channel heat sinks, Applied Thermal Engineering 107 (2016) 870–879.
15. [15] Thanhtrung Dang, Jyh-tong Teng, Jiann-cherng Chu, Tingting Xu, Suyi Huang, Shiping Jin and Jieqing Zheng (2012). Single-Phase Heat Transfer and Fluid Flow Phenomena of Microchannel Heat Exchangers, Heat Exchangers - Basics Design Applications, Dr. Jovan Mitrovic (Ed.), InTech, DOI: 10.5772/32989.
16. [16] M.M. Awad, Y.S. Muzychka, Thermodynamic optimization, heat exchangers – basics design applications, in: J. Mitrovic (Ed.), Heat Exchangers – Basics Design Applications, vol. 1, ch. 1, InTech, Rijeka, pp. 3-52, InTech, ISBN 978-953-51-0278-6, 2012.
17. [17] Mohamed M Awad, A review of entropy generation in microchannels, Advances in Mechanical Engineering 2015, Vol. 7(12) 1–32.
18. [18] S.V. Patankar, A numerical method for conduction in composite materials, flow in irregular geometries and conjugate heat transfer, in: Proceedings of 6th International Heat Transfer Conference, vol. 3, 1978, pp. 297–302.
19. [19] S.V. Patankar, Numerical Heat Transfer and Fluid Flow, Hemisphere, Washington, DC, 1980.
20. [20] Yunus A.Cengel, John M.Cimbala, Fluid Mechanics, Third edition, McGraw Hill Education, New York(2013) [21] Frank M. White, Fluid Mechanics, Seventh edition, McGraw Hill Education (2011).
21. [22] N. Amanifard, M. Fakhrai, A. Arzpeyma, Y. Mojib and M. Abazare, Numerical Analysis Of Fluid Flow And Heat Transfer In Microchannels, Journal of Applied Mathematics Islamic Azad University Lahijan, Autumn 2004, Page 58-70.
22. [23] Dongmei Zhou, Timothy Rau, Thermal Design Methodology and Prediction of Heat Sink Performance, Journal of Thermal Engineering, Yildiz Technical University Press, Istanbul, Turkey Vol. 2, Special Issue 4, No. 4, pp. 826-836, July, 2016.
23. [24] Erdal Çetkin, Inverted Fins for Cooling of a Non-Uniformly Heated Domain , Journal of Thermal Engineering, Yildiz Technical University Press, Istanbul, Turkey Vol. 1, Issue No. 1, pp. 1-9, January, 2015.