Masters Theses

Abstract

"The thermal conductivity of granular materials can be determined by the Thomas method. This method was used here to determine the effects of granular size on the thermal conductivity of sand. A river sand was secured and screened. The sand retained between the Tyler Standard Screen Scale, mesh 10 and 14, 14 and 28, 28 and 40, 40 and 48, 48 and 60, and below mesh 60, was used for tests.

The thermal conductivity for the above six samples obtained by the author coincide fairly well with published data.

It is reported in the International Critical Tables that the thermal conductivity, k, for the sand lies between 0.1728 and 0.2212 Btu/hr-ft-°F, when tested between 32 °F and 320°F. The test conducted by the author between 80°F and 160°F for the above six sizes was very definitely in this range with the higher values of thermal conductivity, k, appearing for the smaller grain size sand.

The heat flow through the sand is by the following methods:

  1. Conduction through the sand where k = 0.45 Btu/hr-ft-°F for solid uniform media.
  2. Convection and conduction through the air in the pore spaces, between the sand grains.
  3. Radiation from sand grain to sand grain in the direction of lower temperature.
  4. A combination of the above.

If the thermal conductivity, k, of the sand grain can be assumed constant, the increase in heat transfer through the finer grained sand is due to the increase in the contact surfaces or due to the radiant heat from the increased surface per unit volume of the finer grained sand"--Abstract, pages ii-iii.

Advisor(s)

Miles, Aaron J.

Committee Member(s)

Nelson, John August
Sauer, Harry J., Jr., 1935-2008
Davidson, Robert F., 1911-1971

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering

Publisher

University of Missouri at Rolla

Publication Date

1964

Pagination

x, 43 pages

Note about bibliography

Includes bibliographical references (pages 41-42).

Rights

© 1964 Kanubhai M. Patel, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 1561

Print OCLC #

5955366

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