TED-AJ03-229 Forced Convection Heat Transfer in a Porous Channel Subjected to Oscillating Flow
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The rapid development in the design of electronic packages for modern high-speed computers has led to the demand for new and reliable methods of chip cooling. For high-speed electronic components, the average dissipating heat flux can be up to 25 W/(cm)^2. Conventional natural or forced convection cooling methods, however, are not capable of removing such a high heat flux for maintaining a proper operational temperature. Therefore, it is imperative to look for new methods of cooling the modern high-speed electronic components. One of these methods is to implement a channel filled with a high conductivity porous medium. Early works related to heat dissipation are those by Cheng et al. [4], Kaviany [5] and Hunt and Tien [6]. Cheng at al. [4] studied the steady flow forced convection in a packed channel with asymmetric heating. Hunt and Tien [6] studied the heat transfer augmentation in a duct filled with foam material subjected to steady flow. Tong et al. [7], Huang and Vafai [8], Hadim and Bethancourt [9], and Sozen [10] numerically studied the heat transfer enhancement of a channel (or duct) filled fully or partially with porous media subjected to steady flow. Fedorov and Viskanta [11] studied the conjugate heat transfer of a porous channel with discrete heat sources numerically. Hwang and Chao [12] studied the heat transfer of sintered bronze bead channels with uniform heat flux of up to 3.2 W/(cm)^2. Compared to foregoing research work done on steady flow through porous channels, published experimental work on oscillating flow heat transfer through porous channels is relatively scarce. Paek et al. [1] experimentally studied pulsating flow through a porous tube. More recently, Fu et al. [2] reported experimental results for heat transfer in porous channels in oscillating flow with aluminum foam materials of 40 pores per lineal inch (PPI) and reticulated vitreous carbon of 45 PPI. This paper reports the results of extensive experiments conducted to study the heat transfer of the porous channel heat sink subjected to steady and oscillating flows using many materials of various porosities viz. aluminum, copper and brass. The surface temperature distributions for both steady and oscillating flows were measured. The local and length-averaged Nusselt numbers were measured and analyzed.
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