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首页> 外文期刊>Heat transfer >Effect of horizontal pressure gradient on Rayleigh-Benard convection of a Newtonian nanoliquid in a high porosity medium using a local thermal non-equilibrium model
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Effect of horizontal pressure gradient on Rayleigh-Benard convection of a Newtonian nanoliquid in a high porosity medium using a local thermal non-equilibrium model

机译：水平压力梯度对局部热非平衡模型在高孔隙介质中牛顿纳米喹吖瑞利 - 乳房对流的影响

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摘要

A study of linear and weakly nonlinear stability analyses of Darcy-Brinkman convection in a water-alumina, nanoliquid-saturated porous layer for stress-free isothermal boundaries, when the solid and nanoliquid phases are in local thermal nonequilibrium, is conducted. The critical eigen-value is found using the Galerkin approach. The effect of the pressure gradient, thermal con-ductivity ratio, interphase heat transfer coeffi-cient, inverse Darcy number, and Brinkman number on the heat transport and onset of con-vection is examined and represented graphically. The critical values of wavenumber and nanoliquid Rayleigh number are found for different problem parameter values. The effect of increasing the porosity-modified ratio of thermal conductivity advances the onset of convection and increases the amount of heat transport, whereas the remaining parameters have the opposite impact on the onset of convection and amount of heat transport. The classical results of the local thermal equilibrium case and Darcy-Benard convection in the presence of pressure gradient are obtained as a limiting case of the present problem.
机译：在水 - 氧化铝，纳米替代饱和多孔层中达西甘露糖碱对流的线性和弱非线性稳定性分析，用于无应力等温界，当固体和纳米喹氢阶段处于局部热非预测时，进行。使用Galerkin方法找到临界特征值。压力梯度，热对延展性比，间传热系数，逆达西数和Brinkman号的效果检查在传热和远程上的发作上，并以图形方式表示。找到了不同问题参数值的波数和纳米替尼瑞瑞格号的临界值。增加热导率的孔隙率改性比率的效果前进对流开始并增加热量传输量，而剩余的参数对对流开始和热传输量的相反影响。在存在压力梯度存在下局部热平衡壳体和达西峰对流的经典结果作为本问题的限制情况。

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