Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/3963
Title: AN EXPERIMENTAL INVESTIGATION OF A THERMAL CONTACT CONDUCTANCE MODEL FOR NOMINALLY FLAT SURFACES
Authors: Rausa, Rohit
Keywords: MECHANICAL & INDUSTRIAL ENGINEERING;THERMAL CONTACT CONDUCTANCE;FLAT SURFACES;CONDUCTANCE
Issue Date: 2012
Abstract: Thermal Contact Conductance (TCC) of the any contacting surfaces is a complex phenomenon and can neither be measured nor calculated directly due to the uncertainty of the size and distribution of the metallic contact areas and the exact dimensions of the interstitial space separating the contact surfaces. The most common way for measurement of contact conductance is the usage of steady-state experiments. Here, two bodies in contact are heated and cooled at their ends, respectively. The temperature distribution of these bodies in an evacuated environment is recorded by means of thermocouples inside the bodies. The linear temperature profile yields the constant gradient and the temperature jump at the interface by extrapolation. With these data the contact heat transfer coefficient can be evaluated. Evidently, there exist a very high temperature drops at the interface and the accuracy in the measurement of TCC largely depends on the correct estimate of the degree of temperature gradient. Furthermore, the evaluation of TCC requires the correct estimate of the contact area which is far trickier and requires the complex solution of the deformation mechanics. Accurate prediction of contact area between the elasto-palstic and plastic deformation is quite challenging and under-represented in the literature. There does not exists any direct method of measuring the thermal contact conductance of an interface between two thin samples, and the evaluation is based on the varieties of deformation models as well as the correlation. Hence, to measure the contact conductance between thin samples, such as in the specific application, it is recommended to implement an optical technique for the temperature measurement across the interface and work with the inverse heat conduction problem. This approach minimizes the complication of working along the deformation theories, and can accurately predict the TCC while working with the transient temperature measurement of optical based tools. The present research proposes a novel experimental setup while using in conjunction with any optical based thermo graphic tool for evaluating the TCC while using IHCP for the correct estimation of
URI: http://hdl.handle.net/123456789/3963
Other Identifiers: M.Tech
Research Supervisor/ Guide: Tariq, Andallib
Sahoo, P. K.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' DISSERTATIONS (MIED)

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