Investigation of Hydraulic and Thermal Performances of Fin Array at Different Shield Positions without By-Pass
In heat sinks, the flow within the core exhibits separation and hence does not lend itself to simple analytical boundary layer or duct flow analysis of the wall friction. In this paper, we present some findings from an experimental and numerical study aimed to obtain physical insight into the influence of the presence of the shield and its position on the hydraulic and thermal performance of square pin fin heat sink without top by-pass. The variations of the Nusselt number and friction factor are obtained under varied parameters, such as the Reynolds number and the shield position. The numerical code is validated by comparing the numerical results with the available experimental data. It is shown that, there is a good agreement between the temperature predictions based on the model and the experimental data. Results show that, as the presence of the shield, the heat transfer of fin array is enhanced and the flow resistance increased. The surface temperature distribution of the heat sink base is more uniform when the dimensionless shield position equals to 1/3 or 2/3. The comprehensive performance evaluation approach based on identical pumping power criteria is adopted and shows that the optimum shield position is at x/l=0.43.
[1] R. W. Knight, J. S. Goodling, D. J. Hall, Optimal thermal design of
forced convection heat sinks-analytical, ASMEJ. Electron. Packaging
113 (1991) 313-321.
[2] P. Teertstra, M. M. Yovanovich, J. R. Culham, T. Lemczyk, Analytical
forced convection modeling of plate fin heat sinks, in: Proceedings of
the Fifteenth IEEE SEMI-THERM Symposium, San Diego,
pp. 34-41.
[3] S. Lee, Optimum design and selection of heat sinks, in: Proceedings of
the Eleventh IEEE SEMI-THERM Symposium, San Jose, CA, 1995,
pp.48-54[4] M. A. Butterbaugh, S. S. Kang, Effects of airflow by-pass on the
performance of heat sinks in electronics cooling, ASME Adv. Electron.
Packaging 10 (2) (1995) 843-848.
[5] H. Shaukatullah, W. R. Storr, B. J. Hansen, M. A. Gaynes, Design and
optimization of pin fin heat sinks for low velocity applications, in:
Proceedings of the Twelfth IEEE SEMI-THERM Symposium, Austin,
TX, 1996, pp.151-163.
[6] H. Jonsson, B. Moshfegh, Modeling of the thermal and hydraulic
performance of plate fin, strip fin, and pin fin heat sinks-influence of
flow by-pass, IEEE Trans. Components Packaging Technol.24 (2)
(2001) 142-149.
[7] M. B. Dogruoz, M. Urdaneta, A. Ortega, Experiments and modeling of
the hydraulic resistance and heat transfer of in-line square pin fin heat
sinks with top by-pass flow, International Journal of Heat and Mass
Transfer 48 (2005) 5058-5071.
[8] S. A. El-Sayed, S. M. Mohamed, A. M. Abdel-latif, A. E. Abouda,
Investigation of turbulent heat transfer and fluid flow in longitudinal
rectangular-fin arrays of different geometries and shrouded fin array,
Experimental Thermal and Fluid Science 26 (2002) 879-900.
[9] H. Jonsson, B. Moshfegh, Enhancement of the cooling performance of
circular pin fin heat sinks under flow by-pass conditions, in: Proceedings
of the Eighth IEEE Inter Society Conference on Thermal Phenomena
(ITHERM), San Diego, CA, 2002, pp.425-432.
[10] C. R. Biber, C. L. Belady, Pressure drop predictions for heat sinks: what
is the best method? ASME Adv. Electron. Packaging 19 (2) (1997)
1829-1835.
[11] A. Dvinsky, A. Bar Cohen, M. Strelets, Thermo fluid analysis of
staggered and in-line pin fin heat sinks, in: Proceedings of the Seventh
IEEE Inter Society Conference on Thermal Phenomena (ITHERM), Las
Vegas, NV, 2000, pp.157-164.
[12] H. Y. Li, G. L. Tsai, S. M. Chiang, J. Y. Lin, Effect of a shield on the
hydraulic and thermal performance of a plate-fin heat sink, International
Communications in Heat and Mass Transfer 36 (3) (2009) 233-240.
[13] G. Tsai, H. Y. Li, C. Lin, Effect of the angle of inclination of a plate
shield on the thermal and hydraulic performance of a plate-fin heat sink,
International Communications in Heat and Mass Transfer 37 (2010)
364-371.
[14] Y.-l. Zhang, J-p. Liu, D-t. Chong 2, J-j. Yan, Experimental investigation
on the heat transfer and flow performances of the fin array with shield in
bypass, International Journal of Heat and Mass Transfer 56 (2013) 674–
682.
[15] R.J. Moffat, Contributions to the theory of single-sample uncertainty
analysis, ASME Transactions Journal of Fluids Engineering 104 (1982)
250–258.
[16] R.J. Moffat, Describing the uncertainties in experimental results, Exp.
Thermal Fluid Sci. 1 (1) (1988) 3–17.
[17] A. Al-Sarkhi, E. Abu-Nada, B.A. Akash, J.O. Jaber, Numerical
investigation of shrouded fin array under combined free and forced
convection, Int. Commun. Heat Mass Transfer 30 (3) (2003) 435- 444.
[18] H. Li, M. Chiang, C. Lee, W. Yang, Thermal performance of plate-fin
vapor chamber heat sinks, International Communications in Heat and
Mass Transfer 37 (2010) 731–738.
[19] H. Li, M. Chiang, Effects of shield on thermal-fluid performance of
vapor chamber heat sink, International Journal of Heat and Mass
Transfer 54 (2011) 1410-1419.
[1] R. W. Knight, J. S. Goodling, D. J. Hall, Optimal thermal design of
forced convection heat sinks-analytical, ASMEJ. Electron. Packaging
113 (1991) 313-321.
[2] P. Teertstra, M. M. Yovanovich, J. R. Culham, T. Lemczyk, Analytical
forced convection modeling of plate fin heat sinks, in: Proceedings of
the Fifteenth IEEE SEMI-THERM Symposium, San Diego,
pp. 34-41.
[3] S. Lee, Optimum design and selection of heat sinks, in: Proceedings of
the Eleventh IEEE SEMI-THERM Symposium, San Jose, CA, 1995,
pp.48-54[4] M. A. Butterbaugh, S. S. Kang, Effects of airflow by-pass on the
performance of heat sinks in electronics cooling, ASME Adv. Electron.
Packaging 10 (2) (1995) 843-848.
[5] H. Shaukatullah, W. R. Storr, B. J. Hansen, M. A. Gaynes, Design and
optimization of pin fin heat sinks for low velocity applications, in:
Proceedings of the Twelfth IEEE SEMI-THERM Symposium, Austin,
TX, 1996, pp.151-163.
[6] H. Jonsson, B. Moshfegh, Modeling of the thermal and hydraulic
performance of plate fin, strip fin, and pin fin heat sinks-influence of
flow by-pass, IEEE Trans. Components Packaging Technol.24 (2)
(2001) 142-149.
[7] M. B. Dogruoz, M. Urdaneta, A. Ortega, Experiments and modeling of
the hydraulic resistance and heat transfer of in-line square pin fin heat
sinks with top by-pass flow, International Journal of Heat and Mass
Transfer 48 (2005) 5058-5071.
[8] S. A. El-Sayed, S. M. Mohamed, A. M. Abdel-latif, A. E. Abouda,
Investigation of turbulent heat transfer and fluid flow in longitudinal
rectangular-fin arrays of different geometries and shrouded fin array,
Experimental Thermal and Fluid Science 26 (2002) 879-900.
[9] H. Jonsson, B. Moshfegh, Enhancement of the cooling performance of
circular pin fin heat sinks under flow by-pass conditions, in: Proceedings
of the Eighth IEEE Inter Society Conference on Thermal Phenomena
(ITHERM), San Diego, CA, 2002, pp.425-432.
[10] C. R. Biber, C. L. Belady, Pressure drop predictions for heat sinks: what
is the best method? ASME Adv. Electron. Packaging 19 (2) (1997)
1829-1835.
[11] A. Dvinsky, A. Bar Cohen, M. Strelets, Thermo fluid analysis of
staggered and in-line pin fin heat sinks, in: Proceedings of the Seventh
IEEE Inter Society Conference on Thermal Phenomena (ITHERM), Las
Vegas, NV, 2000, pp.157-164.
[12] H. Y. Li, G. L. Tsai, S. M. Chiang, J. Y. Lin, Effect of a shield on the
hydraulic and thermal performance of a plate-fin heat sink, International
Communications in Heat and Mass Transfer 36 (3) (2009) 233-240.
[13] G. Tsai, H. Y. Li, C. Lin, Effect of the angle of inclination of a plate
shield on the thermal and hydraulic performance of a plate-fin heat sink,
International Communications in Heat and Mass Transfer 37 (2010)
364-371.
[14] Y.-l. Zhang, J-p. Liu, D-t. Chong 2, J-j. Yan, Experimental investigation
on the heat transfer and flow performances of the fin array with shield in
bypass, International Journal of Heat and Mass Transfer 56 (2013) 674–
682.
[15] R.J. Moffat, Contributions to the theory of single-sample uncertainty
analysis, ASME Transactions Journal of Fluids Engineering 104 (1982)
250–258.
[16] R.J. Moffat, Describing the uncertainties in experimental results, Exp.
Thermal Fluid Sci. 1 (1) (1988) 3–17.
[17] A. Al-Sarkhi, E. Abu-Nada, B.A. Akash, J.O. Jaber, Numerical
investigation of shrouded fin array under combined free and forced
convection, Int. Commun. Heat Mass Transfer 30 (3) (2003) 435- 444.
[18] H. Li, M. Chiang, C. Lee, W. Yang, Thermal performance of plate-fin
vapor chamber heat sinks, International Communications in Heat and
Mass Transfer 37 (2010) 731–738.
[19] H. Li, M. Chiang, Effects of shield on thermal-fluid performance of
vapor chamber heat sink, International Journal of Heat and Mass
Transfer 54 (2011) 1410-1419.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:65430", author = "Ramy H. Mohammed", title = "Investigation of Hydraulic and Thermal Performances of Fin Array at Different Shield Positions without By-Pass ", abstract = "In heat sinks, the flow within the core exhibits separation and hence does not lend itself to simple analytical boundary layer or duct flow analysis of the wall friction. In this paper, we present some findings from an experimental and numerical study aimed to obtain physical insight into the influence of the presence of the shield and its position on the hydraulic and thermal performance of square pin fin heat sink without top by-pass. The variations of the Nusselt number and friction factor are obtained under varied parameters, such as the Reynolds number and the shield position. The numerical code is validated by comparing the numerical results with the available experimental data. It is shown that, there is a good agreement between the temperature predictions based on the model and the experimental data. Results show that, as the presence of the shield, the heat transfer of fin array is enhanced and the flow resistance increased. The surface temperature distribution of the heat sink base is more uniform when the dimensionless shield position equals to 1/3 or 2/3. The comprehensive performance evaluation approach based on identical pumping power criteria is adopted and shows that the optimum shield position is at x/l=0.43.
", keywords = "Shield, Fin array, Performance evaluation, Heat transfer, Validation.", volume = "7", number = "10", pages = "2015-7", }
