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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Combined effects of the inlet temperature and the wall thermal capacitance on the laminar mixed convection in a vertical pipe
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Combined effects of the inlet temperature and the wall thermal capacitance on the laminar mixed convection in a vertical pipe

机译：入口温度和壁热电容对垂直管层流混合对流的综合影响

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Purpose - The aim of this study is to present numerical analyses for combined effects of the inletrntemperature (ΔT~+) and the wall-to-fluid thermal capacitance ratio (a*) on the laminar mixedrnconvection unsteady flows in a vertical pipe.rnDesign/methodology/approach - The full Navier-Stokes and energy, coupled, unsteady state,rntwo-dimensional governing equations for ascending laminar mixed convection in a vertical pipe arernsolved numerically using a finite-difference scheme.rnFindings - The results show that the thermohydraulic flow behaviour is highly dependent on bothrnparameters (ΔT~+, a *). Moreover, the unsteady characteristics of the flow can involve oscillatory andrnreversed flow phenomena yielding the unstable flows. For the heating case, the reversed flow appearsrnbelow the wave instability and the unsteady vortex is always significant in the vicinity of the wall,rnwhatever ΔT~+ and a* < 100. For the cooling case, the reversed flow appears in the central region ofrnthe pipe; it develops on top of the wave instability.rnPractical implications - This study should be very useful to improve heat transfer equipment.rnOriginality/value - The paper shows clearly the combined effects of both parameters (ΔT~+, a *) onrnthe laminar mixed convection flow.
机译：目的-这项研究的目的是提供数值分析，以分析入口温度（ΔT〜+）和壁-流体热容比（a *）对垂直管道中层流对流非稳态流动的综合影响。方法/方法-使用有限差分法数值求解垂直管道中层流混合对流的完整Navier-Stokes和能量，耦合，非稳态，二维控制方程。rnFindings-结果表明，热工水力流动行为高度依赖于两个参数（ΔT〜+，a *）。此外，流动的不稳定特性可能涉及产生不稳定流动的振荡和反向流动现象。对于加热情况，逆流出现在波的不稳定性下方，并且在壁附近，非恒定涡流总是很明显的，无论ΔT〜+和a * <100如何。对于冷却情况，逆流出现在波的中心区域管; rn实际意义-该研究对于改进传热设备非常有用。rn原始值/数值-本文清楚地显示了两个参数（ΔT〜+，a *）对层流混合对流的组合影响流。

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