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The features of startup process and the reasons which result in the failure of small-scale flat-plate type capillary pumped loop (CPL) evaporator during the preheating stage are analyzed. The unsteady heat transfer model of evaporator in the fully-flooded startup stage is presented, and the model is solved with SIMPLE algorithm. The numerical results show the preheating stage of evaporator requires...
An accessorial loop with a micro-pump and ejector is applied into the Capillary Pumped Loop (CPL), and a 3-D model is developed to investigate the operation performance of the ejector. The numerical results show that the mass flux can be enhanced with an accessorial loop. However, a sub-cooler is necessary to locate between the outlet of the ejector and the inlet of the evaporator to condense the...
According to the special geometry configuration of miniature loop heat pipe with small scale flat plate evaporator, the correlativity of flow and heat transfer between each part of the LHP is analyzed and a mathematics model of LHP system is established. With the dynamic equilibrium equation of LHP solved by MATLAB/Simulink software, the connection between each node's pressure and temperature at the...
A novel porous micro heat sink system is presented for dissipating high heat flux of electronic devices. Numerical model for the micro heat sink is proposed to describe heat transfer in the metallic wall and liquid flow and heat transfer in the porous wick structure, and it is solved with SIMPLE algorithm as a conjugate problem. The numerical results showed that the heated surface temperature of porous...
The internal flow of a cross-flow fan was simulated with computation fluid dynamic(CFD), and the influence of the structure parameters of volute tongue on the performance of the cross-flow fan was analyzed. The relationship between the structure parameters of volute tongue and the flow filed of the cross-flow fan was presented and the shape line of the volute tongue was optimized. A new shape line...
A porous micro heat sink system is presented for cooling of high power LEDs, which has high heat transport capability. The operational principle and heat transfer characteristics of porous micro heat sink are analyzed. Numerical model for the micro heat sink is proposed to describe liquid flow and heat transfer based on the local thermal equilibrium of porous media, and it is solved with SIMPLE algorithm...
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