An Experimental Study of Heat Transfer of a Porous Channel Subjected to Oscillating Flow

Abstract

Experiments have been conducted to study the heat transfer of a porous channel subjected to oscillating flow. The surface temperature distributions for both steady and oscillating flows were measured. The local and length-averaged Nusselt numbers were analyzed. The experimental results revealed that the surface temperature distribution for oscillating flow is more uniform than that for steady flow. Due to the reversing flow direction, there are two thermal entrance regions for oscillating flow. The length-averaged Nusselt number for oscillating flow is higher than that for steady flow. The length-averaged Nusselt number for both steady and oscillating flows increase linearly with a dimensionless grouping parameter k*/kfDe/L1/2Pe*1/2. The porous channel heat sink subjected to oscillating flow can be considered as an effective method for cooling high-speed electronic devices.

Forced Convection with Laminar Pulsating Flow in a Saturated Porous Channel or Tube

“…It appears that all the previous analytical studies on that topic are concerned with a time-independent applied pressure gradient, and consequently we are breaking new ground in discussing an applied pressure gradient that varies harmonically with time about a non-zero mean. Somewhat distantly related experimental work on oscillatory forced convection in porous media has been reported by Paek et al (1999), Fu et al (2001), Jin (2004, 2005), while Hsu (2005) has mentioned some unpublished numerical studies by himself and his colleagues.…”

Effect of oscillatory frequency on heat transfer in metal foam heat sinks of various pore densities

“…The length-averaged Nusselt numbers for both oscillating and steady flows were correlated using a grouping parameter proposed by Fu et al [17]. For the purpose of designing a novel heat sink using metal foam subjected to oscillating flow, the relation between the length-averaged Nusselt number and the pumping power of the cooling system for aluminum foam with different pore densities were analyzed.…”

Application of planar laser-induced fluorescence measurement techniques to study the heat transfer characteristics of parallel-plate heat exchangers in thermoacoustic devices

“…(7)(8)(9) are performed by using weighted averaging in space and time (phase). Figure 10 shows the space-averaged heat fluxes in the acoustic cycle for four Reynolds numbers investigated.…”