Obtaining the Efficiency and Effectiveness of Fin in Unsteady State Conditions Using Explicit Finite Difference Method

Petrus Kanisius Purwadi,R.B.P Harsilo,Budi Setyahandana

doi:10.24071/ijasst.v3i1.3280

Abstract

This paper discusses the search for fin efficiency and effectiveness in unsteady state conditions using numerical computation methods. The straight fin under review has a cross-sectional area that changes with the position x. The cross section of the fin is rectangular. The fins are composed of two different metal materials. The computation method used is the explicit finite difference methods. The properties of the fin material are assumed to be fixed, or do not change with changes in temperature. When the stability requirements are met, the use of the explicit finite difference methods yields satisfactory results. The use of the explicit finite difference methods can be developed for various other fin shapes, which are composed of two or more different materials, time-varying convection heat transfer coefficient, and the properties of the fin material that change with temperature.

Highlights

In the design of fins, the important thing to know is the efficiency and effectiveness of the fins
There are many ways to know the value of fin efficiency and fin effectiveness
The results of the calculation of temperature distribution, actual heat flow rate, efficiency and effectiveness of fins are presented in Figure 7, Figure 8, Figure 9 and Figure 10

Summary

Introduction

In the design of fins, the important thing to know is the efficiency and effectiveness of the fins. The energy balance at the control volume in position i = p can be expressed by equation (9): qi−1 +. In the control volume at the fin tip, the process of convection heat transfer through the blanket surface and the cross-sectional surface of the fin tip. The energy balance at the control volume at position i = m can be expressed by equation (10): qc1 + qc. The amount of actual heat released by the fins in the unsteady state condition can be calculated by equation (19):. The efficiency of the fin at an unsteady state condition can be calculated by equation (22): ηn qanct qideal. The effectiveness of the fin at an unsteady state condition can be calculated by equation (23):

Research Methodology

Results and Discussion

Conclusion