A series of experimental investigations with a new modified transient liquid crystal method on the studies related to the fluid flow and heat transfer characteristics in a channel installed with a heat sink have been successfully performed. The parametric studies on the local and average effective heat transfer characteristics for confined heat sinks have been explored. The influencing parameters and conditions include air preheating temperature at channel inlet, flow velocity and heat sink types. Besides, a concept of the amount of enhanced heat transfer (AEHT) is introduced and defined as the ratio of . The ratio is almost independent of Reynolds number for a specific confined heat sink. The ratios are 0.0603 and 0.0124 for fully-confined and unconfined heat sinks, respectively.
Issue Section:
Research Papers
1.
Ellison
, G. N.
, 1989, Thermal Computations for Electronic Equipment
, van Nostrand Reinhold
, New York.2.
Sparrow
, E. M.
, and Grannis
, V. B.
, 1990, “Pressure Drop Characteristics of Heat Exchangers Consisting of Arrays of Diamond-Shaped Pin Fins
,” Int. J. Heat Mass Transfer
0017-9310, 34
, pp. 589
–600
.3.
Kraus
, A. D.
, and Bar-Cohen
, A.
, 1995, Design and Analysis of Heat Sinks
, Wiley
, New York.4.
Ishizuka
, M.
, Yokono
, Y.
, and Hisano
, K.
, 1999, “Experimental Study on The Performance of Compact Heat Sink for LSI Packages
,” ASME J. Electron. Packag.
1043-7398, 26-1
, pp. 713
–718
.5.
Cooper
, T. E.
, Field
, R. J.
, Meye
, J. F.
, 1975, “Liquid Crystal Thermography and its Application to The Study of Convective Heat Transfer
,” ASME J. Heat Transfer
0022-1481, 97
, pp. 442
–450
.6.
Camci
, C.
, Kim
, K.
, Hippensteele
, S. A.
, Poinsatte
, P. E.
, 1993, “Evaluation of a Capturing Based Transient Lliquid Crystal Method for High-resolution Mapping of Convective Heat Transfer on Curved Surfaces
,” ASME J. Heat Transfer
0022-1481, 115
, pp. 311
–318
.7.
Ekkad
, S. V.
, Han
, J. C.
, 1996, “Heat Transfer Inside and Downstream of Cavities Using Transient Liquid Crystal Method
,” J. Thermophys. Heat Transfer
0887-8722, 10
, pp. 511
–516
.8.
Valencia
, A.
, Fiebig
, M.
, Mitra
, K.
, 1995, “Influence of Heat Conduction on Determination of Heat Transfer Coefficient by Liquid Crystal Thermography
,” Exp. Heat Transfer
0891-6152, 8
, pp. 271
–279
.9.
Ekkad
, S. V.
, Zapata
, D.
, Han
, J. C.
, 1995, “Heat Transfer Coefficients Over a Flat Surface With Air and CO2 Injection Through Compound Angle Holes Using a Transient Liquid Crystal Image Method
,” ASME Paper No. 95-GT-10.10.
Hwang
, J. J.
, Cheng
, C. S.
, 1999, “Augmented Heat Transfer in a Triangular Duct by Using Multiple Swirling Jets
,” ASME J. Heat Transfer
0022-1481, 121
, pp. 683
–690
.11.
Jeng
, T. M.
, Wang
, M. P.
, Hwang
, G. J.
, and Hung
, Y. H.
, 2004, “A New Semi-Empirical Model for Predicting Heat Transfer Characteristics in Porous Channels
,” Exp. Therm. Fluid Sci.
0894-1777, 29
, pp. 9
–21
.12.
Jeng
, T. M
, 2002, “Fluid Flow and Heat Transfer Behavior in Porous Channels
,” Ph.D. thesis, Department of Power Mechanical Engineering, National Tsing Hua University, Taiwan.13.
Jeng
, T. M.
, Wang
, M. P.
, Hwang
, G. J.
, and Hung
, Y. H.
, 2004, “Thermal Behavior in Rectangular Channels by Using Transient Liquid Crystal Method
,” Exp. Heat Transfer
0891-6152, 17
, pp. 147
–160
.14.
Schultz
, D. L.
and Jones
, T. V.
, 1973, “Heat Transfer Measurements in Short Duration Hypersonic Facilities
,” NATO Advisory Group Aeronautical RD, AGARDOGRAPH Report No. 165.15.
Kline
, S. J.
, and McClintock
, F. A.
, 1953, “Describing Uncertainties in Single-Sample Experiments
,” Mech. Eng. (Am. Soc. Mech. Eng.)
0025-6501, 75
, pp. 3
–8
.16.
Moffat
, R. J.
, 1986, “Contributions to the Theorey of Single-Sample Uncertainty Analysis
,” ASME J. Fluids Eng.
0098-2202, 104
, pp. 250
–260
.17.
Chai
, T. S.
, Horng
, J. T.
, Wu
, T. Y.
, and Hung
, Y. H.
, 2004, “Thermal Performance Measurement for Confined Heat Sinks
,” in Proceedings of ITHERM 2004
, pp. 302
–309
, Las Vegas, June 1–4.18.
Flotherm Version 3.2
, Flomerics Inc.
, Marlborough, MA, 2001.19.
Sparrow
, E. M
, and Kadle
, D. S.
, 1986, “Effect of Tip-to-Shroud Clearance on Turbulent Heat Transfer From a Shrouded, Longitudinal Fin Array
,” ASME J. Heat Transfer
0022-1481, 108
, pp. 519
–524
.20.
Mills
, A. F.
, 1962, “Experimental Investigation of Turbulent Heat Transfer in the Entrance Region of a Circular Conduit
,” J. Mech. Eng. Sci.
0022-2542, 4
, pp. 63
–177
.21.
Ye
, Q. L.
, 2001, “Multimedia Thermal CAD Package For Electronics Multilayer Structures With Compact Cold Plates
,” Master’s thesis, Department of Power Mechanical Engineering, National Tsing Hua University, Taiwan.Copyright © 2005
by American Society of Mechanical Engineers
You do not currently have access to this content.
