نتایج جستجو برای: heat mass transfer
تعداد نتایج: 909473 فیلتر نتایج به سال:
In this study, the unsteady double-diffusive mixed convection in the one and two-sided lid-driven cavities are studied and compared together using numerical SIMPLE algorithm. Uniform but different temperatures and mass concentrations are assumed at horizontal walls. The used fluid (pure air) was assumed incompressible and Newtonian. The used numerical method is firstly validated against previou...
Heat transfer continues to be a major field of interest to engineering and scientific researchers, as well as designers, developers, and manufacturers. The wealth of applications includes a wide variety of components and systems for energy devices, including general power systems, heat exchangers, high performance gas turbines and other power conversion devices. Other areas of interest include ...
Flow boiling heat transfer with the refrigerants R-134a and R-245fa in copper microchannel cold plate evaporators is investigated. Arrays of microchannels of hydraulic diameter 1.09 mm and 0.54 mm are considered. The aspect ratio of the rectangular cross section of the channels in both test sections is 2.5. The heat transfer coefficient is measured as a function of local thermodynamic vapor qua...
This paper reviews some of our recent applications of computational fluid dynamics (CFD) to model heat and mass transfer problems in neonatology and investigates the major heat and mass-transfer mechanisms taking place in medical devices, such as incubators, radiant warmers and oxygen hoods. It is shown that CFD simulations are very flexible tools that can take into account all modes of heat tr...
واحد الفین به عنوان قلب مجتمعهای پتروشیمی نقش اساسی را در کارکرد این صنعت عظیم ایفا می کند. واحد الفین وظیفه تولید مواد اولیه و پایه ای صنعت پتروشیمی و صنایع وابسته را بر عهده دارد. این واحد با تولید موادی از قبیل اتیلن، پروپیلن و بوتادی ان، استایرن و ... نقشی کلیدی را بر عهده دارد و متعاقبا کارکرد صحیح و بهینه این واحد از اهداف اصلی مجتمع های پتروشیمی می باشد. پر اهمیت ترین بخش این واحد که عمل...
این تحقیق شامل دو بخش مجزا می باشد. در بخش اول حرکت فیلم مایع بر روی صفحات صاف و موجدار به منظور بررسی تاثیر موجدار شدن سطح بر خصوصیت ترشوندگی آن با مطالعه بیشینه ضخامت و پهنای فیلم مایع، بدون حضور فاز گاز در حالت گذرا شبیه سازی شده است. مطالعات نشان داد که پهنای فیلم مایع با کاهش زاویه سطح شیب دار، هنگامیکه زاویه کمتر از 45 درجه می شود، به سرعت افزایش می یابد. ضخامت فیلم مایع هنگامیکه زوایه ...
heat and mass transfer, in this paper, is considered in one-row heat exchanger, that fins are hotter than air flow and water is added to fins. related governing equations are derived by analyzing a two-dimension model in a unique cell of a heat exchange. these equations are numerically solved by finite difference method. heat transfer and efficiency under partially wet surface are calculated by...
We minimize, with respect to the cross sectional area, the mass of a bar given the rate of heat transfer. The bar enhances the heat transfer surface of a larger known mass to which the bar is attached. This article is an extension of a previous publication by two coauthors, where heat transfer from the sides of the bar was neglected and only conduction through its length was considered. The rat...
This article investigates the influence of cross-diffusion on the viscous fluid flow over a porous sheet stretching exponentially by applying the convective thermal conditions. Velocity slip at the boundary is considered. The numerical solutions to the governing equations are evaluated using successive linearisation procedure and Chebyshev collocation method. It is observed from this study that...
Experimental study of flow boiling heat transfer in a microchannel array consisting of main channels connected to two auxiliary channels (each) was conducted. A microbubble-excited actuation mechanism, powered by high frequency vapor bubble growth and collapse, was established to create and sustain strong mixing in the microchannels. It was shown to significantly enhance flow boiling heat trans...
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