## Article citationsMore >>

Adiutori, E. F., 1990, “Origins of the Heat Transfer Coefficient”, *Mechanical Engineering*, August, pp 46-50.

**has been cited by the following article:**

## Article

# Why Heat Transfer Coefficients Are Unnecessary and Undesirable, and How Heat Transfer Problems Are Solved without Them

^{1}Ventuno Press, 1094 Sixth Lane N., Naples, FL 34102

*American Journal of Mechanical Engineering*.

**2020**, Vol. 8 No. 3, 106-110

**DOI:**10.12691/ajme-8-3-2

**Copyright © 2020 Science and Education Publishing**

**Cite this paper:**

Eugene F. Adiutori. Why Heat Transfer Coefficients Are Unnecessary and Undesirable, and How Heat Transfer Problems Are Solved without Them.

*American Journal of Mechanical Engineering*. 2020; 8(3):106-110. doi: 10.12691/ajme-8-3-2.

Correspondence to: Eugene F. Adiutori, Ventuno Press, 1094 Sixth Lane N., Naples, FL 34102. Email: efadiutori@aol.com

## Abstract

For 200 years, convective heat flux

*q*has been calculated by multiplying heat transfer coefficient*h*times boundary layer temperature difference Δ*T*. Since*h*times Δ*T*equals*q, h must*be a symbol for*(q/*Δ*T)*because*(q/*Δ*T)*times*Δ**T*equals*q.**h*(ie*q/*Δ*T*) is generally calculated from correlations derived from experiments in which*q*data and Δ*T*data are used to obtain*(q/*Δ*T){*Δ*T}*correlations-ie*h{*Δ*T}*correlations. (It is not possible to obtain*h*data because*h*is not a parameter.*h*is the ratio of*two*parameters). Heat transfer coefficients are*unnecessary*and*undesirable*. It is self-evident that any problem that can be solved using*q, q/*Δ*T (ie h)*, and Δ*T*can also be solved using only*q*and Δ*T*. Therefore*h*(ie*q/*Δ*T*) is*unnecessary.**h*(ie*q/*Δ*T*) is*undesirable*because, when*q*is a nonlinear function of Δ*T*(as in free convection, condensation, and boiling),*h*(ie*q/*Δ*T*) is an extraneous*variable*, and it*greatly*complicates problem solutions. When*h*has been abandoned, convective heat flux is determined from*q{*Δ*T}*correlations that result from*q*data and Δ*T*data, or from the transformation of*h{*Δ*T}*correlations. (Transformation from*h{*Δ*T}*correlations to*q{*Δ*T}*correlations requires that*h*be replaced by*q/*Δ*T*, and that*q*and Δ*T*be separated.). The text includes example problems that validate the conclusion that*h*(ie*q/*Δ*T*) is unnecessary and undesirable, and demonstrate that the solution of nonlinear problems is much simpler if*h*is abandoned.