Abstract A numerical study on convective mass transfer enhancement by a lateral sweep vortex generator (LSVG)-dimple combination is presented. Surface features that can generate secondary flow structures are widely used for overcoming the difficulties in the transport process encountered in high-speed flows. Unsteady, three dimensional, turbulent fluid flow and mass transfer has been simulated using an Advection Upstream Splitting Method (AUSM) based finite volume solver. An improvised Temperature-Dependent Mass Efflux (TDME) condition is invoked to simulate mass evolution from a liquefying boundary as a function of adjoining fluid temperature. The computational procedure has been validated using experimental data of heat transfer coefficients obtained for a similar vortex generator. Extensive numerical simulations have been performed for various geometry and flow conditions to analyze the nature of the evolution of secondary flow structures and their role in promotion of mass advection. Q-Criterion estimates have been used for identifying regions of intense vortex fluid motion and its role in the promotion of mass transfer. The present vortex generator dimple combination can enhance mass transfer for a wider expanse of the domain. Correlations for the estimation of spatiotemporal convective mass transfer effects have also been derived from unsteady numerical computations.

中文翻译：

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横向扫掠涡发生器和凹坑腔在高速流动中增强对流传质的数值研究

摘要 提出了横向扫描涡发生器(LSVG)-凹坑组合增强对流传质的数值研究。可以产生二次流动结构的表面特征被广泛用于克服高速流动中遇到的传输过程中的困难。已经使用基于对流上游分裂方法 (AUSM) 的有限体积求解器模拟了不稳定的三维湍流流体流动和质量传递。调用临时的温度相关质量流出 (TDME) 条件来模拟从液化边界作为相邻流体温度函数的质量演化。计算过程已经使用为类似涡流发生器获得的传热系数的实验数据进行了验证。已经对各种几何形状和流动条件进行了广泛的数值模拟，以分析二次流结构演化的性质及其在促进质量对流中的作用。Q-Criterion 估计已被用于识别强烈涡流流体运动的区域及其在促进传质中的作用。本涡流发生器凹坑组合可以在更广的域范围内增强传质。估计时空对流传质效应的相关性也来自非定常数值计算。Q-Criterion 估计已被用于识别强烈涡流流体运动的区域及其在促进传质中的作用。本涡流发生器凹坑组合可以在更广的域范围内增强传质。估计时空对流传质效应的相关性也来自非定常数值计算。Q-Criterion 估计已被用于识别强烈涡流流体运动的区域及其在促进传质中的作用。本涡流发生器凹坑组合可以在更广的域范围内增强传质。估计时空对流传质效应的相关性也来自非定常数值计算。