A predictive formula for the Nusselt number of compressible laminar fluid flow passing the thermal developing zone of a hot tube

Abstract

Many of the industrial and engineering problems need to know the value of the convective heat transfer coefficient of fluid flows within various tools, systems, or tubes. In the present study, a predictive formula has been obtained for the Nusselt number for compressible laminar flows passing the velocity developed and thermal developing zone of a hot tube with different angles with the horizon. A fractional factorial experimental design method and an optimization method have been utilized for obtaining a width range and accurate formula. Finally, the ability of this formula has been examined using a set of testing data.

Investigating thermal developing zone of compressible laminar flow inside hot tube

“…All of these studies were valuable only for the flows of compressible fluids inside a vertical hot tube. In addition, an applicable Nusselt formula has been obtained for calculating the convective heat transfer for using in such problems (Abolpour and Shamsoddini, 2019).…”