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Description: Most agricultural and food products are complex materials and therefore their fundamental physical properties are often difficult to measure accurately. This is especially true in determining the thermal conductivity (or diffusivity) of granular materials such as grains. Not only is the internal structure often heterogeneous but also the surface of grains usually consists of a skin with totally different properties. Consequently, the conditions of heat conduction within the grain particle vary from point to point as well as in direction at each point. To compound the problem further, the size of the particle is too small to perform direct measurements on individual particles. All of these problems make it very difficult to determine an accurate value of thermal conductivity by means of the classical methods of measurement. All the classical methods are based on the assumption that the material sample is homogeneous and isotropic so that when a point in the sample is heated, heat flows out equally well in all directions. Obviously, in the case where the sample consists of a number of granular particles, heat conduction in certain directions is more favorable than others and therefore the sample is an anisotropic system.

Keywords: determination of heat transfer parameters using frequency response analysis
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Citation: Otten, Lambert 1974. DETERMINATION OF HEAT TRANSFER PARAMETERS USING FREQUENCY RESPONSE ANALYSIS. Canadian Agricultural Engineering 16(2):103-106.
Volume: 16
Issue: 2
Pages 103 - 106
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Date: 1974
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Coverage: Canada
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