Combined free and forced convection in a constant temperature horizontal tube
- 1 March 1961
- journal article
- research article
- Published by Wiley in AIChE Journal
- Vol. 7 (1) , 38-41
- https://doi.org/10.1002/aic.690070111
Abstract
An experimental study of superposed free and forced convection for air in a horizontal tube is reported. The laminar Nusselt number, based on the log mean temperature difference, ranged from 29.9 to 15.2; the laminar flow Graetz number, based on the bulk or average temperature of the air, ranged from 33 to 1,300, the Grashof‐Prandtl modulus based on properties of air at the wall temperature ranged from 1.1 × 106to 2.2 × 106. The Grashof number utilized the log mean temperature difference. An analysis of the system from a macroscopic viewpoint led to the determination of an equation which fits the laminar flow experimental data in the range of Graetz numbers from 60 to 1,300. An equation was also found for the turbulent data.Keywords
This publication has 3 references indexed in Scilit:
- Combined Free and Forced Convection in a Constant-Temperature Vertical TubeTransactions of the American Society of Mechanical Engineers, 1958
- Numerical Solutions for Laminar-Flow Heat Transfer in Circular TubesTransactions of the American Society of Mechanical Engineers, 1955
- Convective Heat Transfer for Mixed, Free, and Forced Flow Through TubesTransactions of the American Society of Mechanical Engineers, 1954