A Historical Misperception on Calculating the Average Convection Coefficient in Tubes With Constant Wall Heat Flux
- 17 April 2019
- journal article
- research article
- Published by ASME International in Journal of Heat Transfer
- Vol. 141 (6)
- https://doi.org/10.1115/1.4043303
Abstract
The historical approach to averaging the convection coefficient in tubes of constant wall heat flux leads to quantitative errors in short tubes as high as 12.5% for convection into fully developed flows and 33.3% for convection into hydrodynamically developing flows. This mistake can be found in teaching texts and monographs on heat transfer, as well as in major handbooks. Using the correctly defined relationship between local and average convection coefficients, eight new correlations are presented for fully developed and developing flows in round tubes and between parallel plates for the constant wall heat flux condition. These new correlations are within 2% of exact solutions for fully developed flows and within 6% of first principle calculations for hydrodynamically developing flows.Keywords
This publication has 9 references indexed in Scilit:
- Handbook of Fluid DynamicsPublished by Taylor & Francis Ltd ,2016
- Laminar Forced Convection Heat Transfer in the Combined Entry Region of Non-Circular DuctsJournal of Heat Transfer, 2004
- Correlations for simultaneously developing laminar flow and heat transfer in a circular tubeInternational Journal of Heat and Mass Transfer, 1993
- Laminar forced convection of power-law non-Newtonian fluids inside ductsWärme- und Stoffübertragung, 1986
- Laminar forced convection to non-Newtonian fluids in ducts with prescribed wall heat fluxInternational Communications in Heat and Mass Transfer, 1986
- Laminar forced convection heat transfer of a non-newtonian fluid in a square ductInternational Journal of Heat and Mass Transfer, 1977
- Correlations for Laminar Forced Convection in Flow Over an Isothermal Flat Plate and in Developing and Fully Developed Flow in an Isothermal TubeJournal of Heat Transfer, 1973
- Correlations for Laminar Forced Convection with Uniform Heating in Flow over a Plate and in Developing and Fully Developed Flow in a TubeJournal of Heat Transfer, 1973
- Finite difference analysis of forced-convection heat transfer in entrance region of a flat rectangular ductFlow, Turbulence and Combustion, 1964