Kim Thomas

Abstract

A one-dimensional, time transient, heat transport model is developed using the heat equation to solve for the internal temperature distribution with heating from both boundaries. The model includes the effects of moisture on heat transfer within a homogeneous porous medium, in this case paper. The effects of phase change, conduction, and vapor transport are included. With the input of system properties - initial paper temperature, ambient relative humidity (RH), and temperature boundary conditions - the model computes the spatial distribution of temperature, saturation and vapor pressure, and liquid and vapor moisture content. By matching temperature curves for various conditions of relative humidity using a trial and error method, results showed that the effective thermal conductivity increased over the base dry value with increasing relative humidity. In the symmetric case the conductivity increased as much as 2.4X under initial conditions of 80% RH. Similar modeling runs with asymmetric temperature boundary conditions yielded an effective thermal conductivity increase of 3. IX for the 80% RH case.

Library of Congress Subject Headings

Porous materials--Thermal properties--Simulation methods; Heat--Transmission--Simulation methods; Thermodynamics--Experiments; Thermodynamics--Simulation methods

Publication Date

3-1-1994

Document Type

Thesis

Department, Program, or Center

Mechanical Engineering (KGCOE)

Advisor

Sciremammano, Frank

Advisor/Committee Member

Domoto, Gerald

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TJ260 .T485 1994

Campus

RIT – Main Campus

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