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Mrs. Maryam Haghighi (PhD student of Chemical Engineering), 6 September 1389 his doctorate thesis titled "Modeling and simulation of heat exchangers equipped with non isotherms foam" on the advice of the doctor, N. large.
In the present work hydrodynamic and thermal modeling and simulation of fluid in the heat exchanger has been fitted with foam. In order to achieve this goal, the equations efoam of continuity, momentum and heat transfer simultaneously to the fluid inside the pipe and foam porous media has been resolved. Momentum equation in the foam sentences Darcy pressure drop caused by friction and inertia is considered. Also, due to the difference in coefficient of thermal conductivity of the metal foam and foam fluid passing through the assumption of non-isothermal fluid and foam in the foam is porous. Apply the correct boundary condition for equations of heat transfer in the wall of the present work is challenging. In the present work approaches have been considered for the nodal points on the wall. Assuming a continuous integration environment and write equations of heat transfer as nodal points in the computing field inside and outside of the pipe and the other assuming a heat source efoam to the points on the pipe wall to the second view more accurate results are presented. The proposed algorithm has been solved by Computational Fluid Dynamics. In the present work algorithms Symplr efoam solutions to address the lack of convergence efoam and convergence of the findings have been modified. Accurate modeling of heat exchangers studied Karhazr, with respect to all terms of pressure, heat transfer equations assume Ghyrhmdmayy for the foam pipe wall boundary conditions with variable temperature correction algorithms proposed in this thesis was to solve some shortcomings Previous work has been removed. By solving the model diagram changes of temperature efoam and fluid velocity transducer length and radius obtained. The results of modeling and experimental results show good agreement with a simple analytical model. The charts of the isothermal lines indicating Hmsrt and thermal boundary layer and velocity boundary layer are also provided. The results show that the use of foam in the heat exchangers, heat flux transmitted through the wall and significantly increases the efficiency of the converter. The increase compared with non-foam efoam tubes can also be about 4 times.
In the present work an analytical model based on the geometric properties of three-dimensional foam was developed that was used to develop the microscopic point of view. With this view, the shortcomings of previous models such as the lack of attention to whether or not isotropic foam geometry, lack of attention to the shape of the cross section of metal foam by varying degrees of porosity and lack of attention to the existence of solid nodules efoam in place of metal fibers to each other on the Elimination efoam is. Lack of anisotropic porous media foam can be considerable error to about% 6/59 cause.
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