Sivasankaran Sivanandam, Bhuvaneswari Marimuthu, Alzahrani Abdullah K
Mathematical Modelling and Applied Computation Research Group, Department of Mathematics, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Department of Mathematics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai 602105, India.
Entropy (Basel). 2024 Mar 10;26(3):245. doi: 10.3390/e26030245.
In this study, numerical simulations are conducted with the goal of exploring the impact of the direction of the moving wall, solute and thermal transport, and entropy production on doubly diffusive convection in a chamber occupied by a Casson liquid. Wall movement has a significant impact on convective flow, which, in turn, affects the rate of mass and heat transfer; this sparked our interest in conducting further analysis. The left and right (upright) walls are preserved with constant (but different) thermal and solutal distributions, while the horizontal boundaries are impermeable to mass transfer and insulated from heat transfer. Numerical solutions are acquired using the control volume technique. Outcomes under a variety of Casson fluid parameters, including Ri, Gr, buoyancy ratio, and direction of the moving wall(s), are explored, and the influences of entropy generation are comprehensively investigated. While the flow field consists of a single cell in case I, it is dual-cellular in case III for all values of the considered parameters. Comparing the three cases, the average heat and mass transport presented lower values in case III due to the movement of an isothermal (left) wall against the buoyant force, while these values are enhanced in case I. The obtained results are expected to be useful in thermal engineering, material, food, and chemical processing applications.
在本研究中，进行了数值模拟，目的是探究移动壁的方向、溶质和热传输以及熵产生对由卡森液体占据的腔室内双扩散对流的影响。壁面运动对对流流动有显著影响，进而影响质量和热传递速率；这引发了我们进行进一步分析的兴趣。左右（直立）壁面保持恒定（但不同）的热分布和溶质分布，而水平边界对质量传递不可渗透且绝热。使用控制体积技术获得数值解。研究了包括里查德森数（Ri）、格拉晓夫数（Gr）、浮力比和移动壁面方向在内的各种卡森流体参数下的结果，并全面研究了熵产生的影响。在情况I中，流场由单个单元组成，而在情况III中，对于所有考虑的参数值，流场都是双单元的。比较这三种情况，由于等温（左）壁面逆着浮力移动，情况III中的平均热传输和质量传输呈现较低的值，而在情况I中这些值有所增强。预期所获得的结果将在热工程、材料、食品和化学加工应用中有用。
