Abstract
The performance of impingement air cooled plate fin heat sinks differs significantly from that of parallel flow plate fin heat sinks. The impinging flow situations at the entrance and the right-angled bends of the plate fin heat sink are quite involved. Flow characteristics of a plate fin heat sink with elliptic bottom profiles cooled by a rectangular impinging jet with different inlet widths are studied by numerical simulations. The results of pressure drop of numerical simulations and experimental results match quite well. The numerical results show that at the same flow rate, the pressure drop decreases with the increase of the impingement inlet width, and the pressure drop increases significantly with the increase of the fin height. The larger the impingement inlet width of air-cooled plate fin heat sink, the milder the pressure drop changes with velocity. Pressure drop for an impinging plate fin heat sink without elliptic bottom profiles is larger than that with elliptic bottom profiles at the same inlet width and velocity. Based on the fundamental developing laminar continuum flow theory, an improved model which is very concise and nice for quick real world approximations is proposed. Furthermore, this paper verifies the effectiveness of this simple impinging pressure drop model.
Highlights
As the function of modern computers advances, the dissipating heat in electronic environment is increasing with power flux
The goal of this paper is to study the pressure drop distribution of a plate fin heat sink based on impinging flow with different inlet widths, fin heights, flow velocities, and channel shapes and verify the effectiveness of this improved concise pressure drop model
This paper investigated the pressure drop of a plate fin heat sink subjected to an impinging flow with elliptic bottom profiles
Summary
As the function of modern computers advances, the dissipating heat in electronic environment is increasing with power flux. Thermal dissipation in the electronic equipment is significantly difficult because of high heat load. The cooling method with impinging flow for heat sinks is interest of researchers for solving these problems. The heat performance of a heat sink depends significantly on the flow-stream direction. Counter-flow has better potential to accomplish high heat removal. The thermal performance of impinged flow may precede that of cross flow since the flow type for a heat sink with impinging flow is in-between the counter-flow and cross-flow. It has a better cooling capacity for impinging flow than for parallel flow because of its high cooling effectiveness [1]
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