首页> 外文期刊>International Journal of Heat and Mass Transfer >Mixed convective heat transfer in an enclosure containing a heat-generating porous bed under the influence of bottom injection
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Mixed convective heat transfer in an enclosure containing a heat-generating porous bed under the influence of bottom injection

机译:在底部注水的影响下,在装有发热多孔床的机壳中的混合对流传热

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摘要

The present study numerically models the process of heat removal from a heat-generating porous bed with cold fluid injection from the bottom of the bed. This type of situation is encountered during post-accident situations in nuclear reactors and involves augmentation of heat removal capacity with forced coolant injection from the bottom. A steady-state analysis is carried out with the assumption of laminar flow regime and without accounting for phase change. Darcy-Brinkmann-Forchheimer approximation and local thermal equilibrium assumption are adopted for modelling the momentum and energy equations in porous media, respectively. It is observed that the fluid flow is determined based on the domi-nancy of the two co-existing flow mechanisms viz. inertial flow due to forced fluid injection and buoyancy-driven flow due to heat generation within the porous bed. In addition, permeability of the porous media significantly affects the flow mechanism, especially near the fluid inlet. Heat transfer characteristics closely follow the flow mechanism established within the enclosure.
机译:本研究在数值上模拟了从产热多孔床中从床底注入冷流体的过程。在核反应堆发生事故后的情况下会遇到这种情况,这种情况涉及通过从底部强制注入冷却剂来提高排热能力。在假定层流状态且不考虑相变的情况下进行稳态分析。采用Darcy-Brinkmann-Forchheimer逼近和局部热平衡假设分别对多孔介质中的动量方程和能量方程建模。观察到,流体流量是基于两个共同存在的流动机制的支配力来确定的。由于强制流体注入而产生的惯性流,以及由于多孔床内部产生的热量而产生的浮力驱动的流。另外,多孔介质的渗透性显着影响流动机理,特别是在流体入口附近。传热特性严格遵循外壳内建立的流动机制。

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