An Experimental Investigation of Heat Transfer Enhancement by Pulsating Laminar Flow in a Triangular Grooved Channel

Abstract

Heat transfer enhancement by pulsating flow in a triangular grooved channel has been experimentally investigated. Effects of Reynolds number Re, Strouhal number St, pulsation amplitude A on the heat transfer enhancement were studied. The experimental results show that, the pulsating flow can significantly enhance heat transfer compared to the steady flow case, for instance, an enhancement of 115% is achieved at Re=400, A=0.5 and St=0.3. There exists an optimal Strouhal number corresponding to the maximum heat transfer enhancement factor. The heat transfer enhancement factor increases with the increase of Reynolds number and pulsation amplitude.

An Experiment Investigation of Heat Transfer Enhancement by Pulsating Laminar Flow in Rectangular Grooved Channels

“…To measure the temperatures of the fluid and the heated grooved wall, a number of T-type thermocouples were installed at different positions, such as one at the entrance, one at the exit, five at the 2nd, 5th, 8th, 10th, 12th and 24th grooves respectively. The experimental apparatus is the same as that in the previous study of Yang [7]. The pulsation fraction A is defined as the ratio of the pulsating flow rate m p from the plunger pump to the total flow rate m…”

Quantitative Visualization of Heat Transfer in Oscillatory and Pulsatile Flows

“…The top and bottom plane walls of the test section are manufactured of low thermal conductivity material to maintain approximately adiabatic thermal boundary conditions. Details on the experimental setup and instrumentation are available elsewhere (Amon et al 1992;Farhanieh et al, 1993;Kang, 2002). In both channels, above a critical Reynolds number and at sufficient downstream distance, a periodically, fully developed flow regime is established.…”