Abstract
In this paper, the laminar heat transfer of natural convection on vertical surfaces is investigated. Most of the studies on natural convection have been considered constantly whereas velocity and temperature domain, do not change with time, transient one are used a lot. Governing equations are solved using a finite volume approach. The convective terms are discretized using the power-law scheme, whereas for diffusive terms the central difference is employed. Coupling between the velocity and pressure is made with SIMPLE algorithm. The resultant system of discretized linear algebraic equations is solved with an alternating direction implicit scheme. Then a configuration of rectangular fins is put in different ways on the surface and heat transfer of natural convection on these surfaces without sliding is studied and finally optimization is investigated.
Highlights
This document is a natural convection is observed as a result of the movement of fluid because of density changes which is caused by heating process
Coupling between the velocity and pressure is made with SIMPLE algorithm
The fluid which is adjacent to the vertical surface with constant temperature, and the fluid temperature is less than the surface temperature, a velocity boundary layer forms the natural convection
Summary
This document is a natural convection is observed as a result of the movement of fluid because of density changes which is caused by heating process. The movement of fluid, whether gas or liquid, in natural convection is caused by buoyancy force due to density reduction beside to heat transfer's surfaces in heating process. Bhavnani and Burgles [3] after several experiments proved that making special changes on vertical surfaces (horizontal little fins) reduces heat transfer in the natural convection heat transfer process. This conclusion can cause changes in the ways of insulating heat repelling surfaces and in this respect is of great importance. On the other hand we face many practical technologies causing natural convection heat transfer on the fins vertical surfaces This matter is more obvious in the electronic circuit in which segment duty cycle is highly effected by the duty cycle.
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