Transient Response of Longitudinal Fins under Step Changes in ‎Base Temperature and Heat Flux using Lattice Boltzmann ‎Method

Publish Year: 1401
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_JACM-8-3_012

تاریخ نمایه سازی: 18 اسفند 1400

Abstract:

The present article reports the transient response of longitudinal fins having linear and non-linear temperature dependent thermal conductivity, convection coefficient and internal heat generation under two cases of base boundary condition, (i) step change in base temperature and (ii) step change in base heat flux. The fin tip is assumed to be adiabatic. Both, linear and non-linear, temperature dependency of thermo-physical properties is addressed in the mathematical formulation and the solution for the above cases is obtained using Lattice Boltzmann method (LBM) implemented in an in-house source code. LBM, being a dynamic method, simulates the macroscopic behavior by using a simple mesoscopic model and offers enormous advantages in terms of simple algorithm to handle even the most typical of boundary conditions that are easy and compact to program even in case of complicated geometries too. Although the transient response of longitudinal fins has been reported earlier, however power law variation of thermophysical properties for the above two base condition has not been reported till date. The present article first establishes the validity of LBM code with existing result and then extends the code for solving the transient response of the longitudinal fin under different sets of application-wise relevant conditions that have not been treated before. Results are reported for several combination of thermal parameter and are depicted in form of graphs.

Authors

Abhishek Sahu

Department of Mechanical Engineering, National Institute of Technology Raipur, Chhattisgarh, ۴۹۲۰۱۰, India

Shubhankar Bhowmick

Department of Mechanical Engineering, National Institute of Technology Raipur, Chhattisgarh, ۴۹۲۰۱۰, India‎

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