Računska analiza konvektivnog prenosa toplote preko vertikalne cevi

Jashanpreet Singh,Chanpreet Singh

doi:10.5937/fme2104932s

Abstract

This paper deals with the numerical investigation of the convective mode of heat transfer across a vertical tube. Experiments were carried out using air as a fluid in a closed room by achieving a steady-state condition. Implicit scheme of finite difference method was adopted to numerically simulate the free convection phenomenon across vertical tube using LINUX based UBUNTU package. Numerical data were collected in the form of velocity, temperature profiles, boundary layer thickness, Nusselt number (Nu), Rayleigh's number (Ra), and heat transfer coefficient. The results of the Nusselt number showed a good agreement with the previous studies. Results data of heat transfer coefficient indicate that there were some minor heat losses due to radiation of brass tube and curvature of the tube.

Highlights

Convection is a branch of heat transfer that deals with a variety of engineering applications like heat exchangers, green–house effect generators, radiators, condensers, air conditioners, refrigerators, electronics, etc. [1,2]
The Prandtl number (Pr) < 1 for methane indicates that the buoyant forces directly controlled the velocity profile
Numerical data were collected for the velocity, temperature profiles, boundary layer thickness (δ), Nusselt number (Nu), Rayleigh's number (Ra), and heat transfer coefficient (h)

Summary

Introduction

Convection is a branch of heat transfer that deals with a variety of engineering applications like heat exchangers, green–house effect generators, radiators, condensers, air conditioners, refrigerators, electronics, etc. [1,2]. Convection is a branch of heat transfer that deals with a variety of engineering applications like heat exchangers, green–house effect generators, radiators, condensers, air conditioners, refrigerators, electronics, etc. Numerous numerical and experimental studies were carried out by various researchers to investigate the free convection phenomenon across the horizontal and vertical cylinders [3,4,5,6,7]. Methane is generally stored in liquid a form. The applications of methane in different industries are in the manufacturing of organic chemicals, used as refrigerated liquid, to run the power engines and turbines, in automobiles, ovens and water heaters, greenhouse effect generators, etc. During the transferring or conveying process, the metallic cylinders get heated on the surfaces. In this context, the boundary layer phenomenon plays a crucial role

Methods

Results

Conclusion