The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Heat transfer coefficients in an agitated vessel using verticle-tube baffles
Author:	Barrasso, Edward Joseph
View Online:	njit-etd1956-002 (x, 72 pages ~ 2.9 MB pdf)
Department:	Department of Chemical Engineering
Degree:	Master of Science
Program:	Chemical Engineering
Document Type:	Thesis
Advisory Committee:	Keeffe, George C. (Committee chair) Mantell, C. L. (Committee member) Salamone, Jerome J. (Committee member)
Date:	1956-06
Keywords:	Heat -- Transmission
Availability:	Unrestricted
Abstract:	Data are presented to show the effect of impeller speed, impeller type, and fluid properties on the forced-convection film coefficient of heat transfer for verticle tubes in a cylindrical vessel. A generalized equation to predict the film coefficient of heat transfer on the outside of verticle tubes in an agitated vessel for both cooling and heating is also presented. This equation may be used to estimate the necessary areas of heat transfer for verticle tubes in an agitated vessel within the degree of accuracy required from most engineering calculations. This study was the first initiated to develop an equation to predict film coefficients of heat transfer for verticle tubes in an agitated vessel from fluid properties, agitator speed and system dimensions. Dunlop and Rushton (6) have developed a generalized equation to predict film coefficients of heat transfer for verticle tubes in an agitated vessel since this study was initiated. The data of this thesis do not fit the equation proposed by Dunlop and Rushton. This is probably due to the difference in system dimensions and dissimilarity between their equipment and the equipment of this thesis. In the course of this study it was further determined that for a well baffled system both radial flow and axial flow impellers have the same effect on the film coefficient. Previous investigators have proposed that the exponent of the viscosity ratio was constant. It was determined in the work of this thesis that this is not true and that the ratio is a function of the fluid properties.