International Conference on Mechanical, Industrial and Energy Engineering 2020 19-21 December, 2020, Khulna, BANGLADESH * Corresponding author. Tel.: +88-01723950919 E-mail address: aywan.das96@gmail.com ICMIEE20-103 CFD Analysis of Conductive Heat Transfer in Different Porous Foams Aywan Das and Dr. Khandkar Aftab Hossain Department of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna-9203, BANGLADESH ABSTRACT A very large number of computational models have already been proposed to evaluate thermal conductivity for high-porosity foams. Each and every approach considered different cellular morphologies and used different solution methods and all they have significant differences. Porous foams are generally used as insulators. So, the effective thermal conductivity of high porous materials, like polyvinyl chloride, expanded polystyrene, asbestos and fiberglass for various meshes are measured to determine the best porous foam that gives the best insulation. Then the results are compared between them and with the results of the previous investigations. It had been found out that effective thermal conductivity is inextricably related to porosity. Effective thermal conductivity decreases with the increasing of porosity such as for polyvinyl chloride, the value decreases from 0.56 to 0.43 for increasing the porosity from 0.75 to 0.95. Similar results are observed for other materials too. Keywords: Thermal conductivity, porosity, solid fraction. 1. Introduction: Heat transfer process can be seen surrounding us. It is a condition wherein the energy transfer occurs between frameworks that communicate with each other due to differences in temperature. It is also a phenomenon that occurs at the boundary of the system. It tends to be portrayed as a rearrangement of internal energy in the system. Conduction occurs when two objects at different temperatures are in contact with each other. Heat flows from the hotter to the cooler item until they both attain a similar temperature. Conduction is the movement of heat through a substance by the collision of molecules. Constant and fast mechanical advances in modern manufacturing necessitate that plan and activity issues be settled as fast as conceivable so as to keep organizations competitive, particularly in terms of energy efficiency and low costs. For a long time, tests and observational examinations have been the favored arrangement devices for mechanical investigation. Despite the robust and reliable nature of experimental methodology, certain variables limit its relevance scope. For example, computation of effective thermal conductivity in different materials for various porosity is usually very complicated thing. But use of the CFD code can bring both simple significance and acceptable solution. At first, a non-thorough survey of the scientific and mathematical models created to anticipate the effective conductivity of cell materials, and it was conducted by Coquard and Baillis [1]. The first attempt of estimation was made by Russel with this effective conductivity from theoretical considerations, and a correlation was proposed by him for plastic foams with high-porosity. Also, he examined conduction through a solid lattice, with cubic cells surrounding inline accepting a uniform cell-wall thickness [2]. Other authors, for example, Maxwell or Eucken, Doherty and Misnar proposed connections like this relation, wherein the porosity is the main auxiliary parameter. They have been audited by Solo'rzano et al. [3] what's more, prompted fundamentally the same as varieties of the effective conductivity. Later it is discovered that the state of the cell structure impacts the conductive heat transfer. Consequently, an increasingly broad investigation was directed by Schuetz and Glicksmann [4]. They were enthusiastic about the conductivity of high-porosity polymeric foams formed of closed or open-cells. They simplified some of the methodology (homogeneous cells, windows with steady thicknesses, swaggers with square cross segments, dodecahedral cells and so forth). They described the foam as a system of thermal resistances and made a few assumptions about how the method would be solved to obtain an explanatory expression for the effective conductivity in which the solid fraction and the porosity in the struts f s are the only structural parameters: k eff = εk fluid + ((1-ε) (2-f s )/3) k solid However, the assumptions permitting analytical treatment of the issue, which can arise question. Later