Heat and mass transport in porous media with phase change

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Heat and mass transport in porous media with phase change "
M. P. Mughal O. A. Plumb

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1113290
Doc. No	:	TLpq304050202
Main Entry	:	M. P. Mughal
	:	O. A. Plumb
Title & Author	:	Heat and mass transport in porous media with phase change\ M. P. MughalO. A. Plumb
College	:	Washington State University
Date	:	1993
student score	:	1993
Degree	:	Ph.D.
Page No	:	148
Abstract	:	In this numerical and experimental study, three problems related to heat and mass transfer in porous media are examined. The first two deal with melting in a packed bed containing a mixture of particles having different melting points. It is demonstrated that through the application of heat, either at the boundaries or internally, a densified zone can be produced. It is also demonstrated that for a one dimensional bed with uniform internal heat generation and convective boundaries, the liquid transport is dominated by capillary forces for low Bond number (Bo = 10 whereas at high Bond number (Bo = 10 the bulk of the liquid pools at the bottom of the bed due to gravity. It is demonstrated that for Biot number larger than 18, the process is internally controlled. Very little liquid transport takes place at high Prandtl numbers (Pr = 27) because of high liquid viscosity. The rate of the process is controlled primarily by the magnitude of the internal heat generation. It is shown that the use of constant thermophysical properties for modeling the problem can result in an error of as much as 13% in the saturation profiles. The third problem is an experimental study of boiling and condensation on porous surfaces similar to those used in heat pipe applications. The study of five different configurations of copper foam metal reveals that the use of channels on the boiler side of the wick enhances the boiler performance by as much as 300% using R11 as a working fluid. A mathematical model was developed to predict the wicking limit of the heat pipe. This model predicted the experimental results with a 12.5% deviation. The model predicts, that, the wicking limit can be increased by a factor of 43 if water is used instead of R11.
Subject	:	Applied sciences
	:	Chemical engineering
	:	heat transfer
	:	Materials science
	:	Mechanical engineering
	:	Mechanical engineering