Theoretical analysis of laminar film condensation in a rotating cylinder with a scraper |
| |
Authors: | S W Peng |
| |
Institution: | (1) Department of Mechanical Engineering University of Saskatchewan, 57 Campus Drive Saskatioon Saskatchewan 57N 5A9, Canada, CA |
| |
Abstract: | The rimming film condensation on the inside wall of a rotating cylinder with a scraper is analyzed. The whole cylinder is
divided into two regions, one is the so-called boundary layer region where the radial velocity of the condensate is much smaller
than the peripheric velocity so that the boundary layer theory is assumed to be valid; the other is the scraper region where
because of the disturbance of the scraper the boundary layer theory does not apply. The boundary layer integral method in
the boundary layer region coupling with the integral momentum theorem across the scraper region provides a method to determine
the velocity, temperature, and film thickness distributions, and heat transfer coefficients. An extensive discussion about
the previous models is given. The sublayer flow rate constancy principle and the variability principle of the boundary layer
thickness (therefore the interface velocity) at the scraper position with respect to the rotational speed are proposed. The
present model greatly improved the prediction of the average heat transfer coefficient.
Received on 5 January 1998 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|