Effect of Circumferential Wall Heat Conduction on Boundary Conditions for Convection Heat Transfer from a Circular Tube in Cross Flow

J. Ocean Eng. Technol. 2001;15(2):39-45.

원관 주위의 대류 열전달에서 경계조건에 대한 원주방향 열전도의 영향

이상봉,이억수,김시영

부경대학교 대학원 제어기계공학과,동의공업대학 기계설계과,부경대학교 기계공학부

Keywords: Local convection heat transfer, Circumferential wall heat conduction, Nondimensional parameter K*, One-dimensional and two-dimensional solutions, Non-uniform heat flux

핵심용어: 국소 대류열전달, 원주방향 열전도, 무차원계수 K*, 1차원과 2차원해, 불균일 열유속

Abstract

With uniform heat generation from the inner surface of the cylindrical heater placed in a cross flow boundary condition, heat flow that is conducted along the wall of the heater creates a non-isothermal surface temperature and non-uniform heat flux distribution. In the present investigation, the effects of circumferential wall heat conduction on convection heat transfer is investigated for the case of forced convection around horizontal circular tube in cross flow of air. The wall conduction number which can be deduced from the governing energy equation should be used to express the effect of circumferential wall heat conduction. It is demonstrated that the circumferential wall heat conduction influences local Nusselt numbers of one-dimensional and two-dimensional solutions.