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Dynamics of Liquid Solidification: Thermal Resistance of by Zygmunt Lipnicki

By Zygmunt Lipnicki

This monograph comprehensively describes phenomena of warmth movement in the course of part switch in addition to the dynamics of liquid solidification, i.e. the advance of a solidified layer. The e-book offers the reader with uncomplicated wisdom for sensible designs, in addition to with equations which describe approaches of strength transformation. the objective viewers essentially includes researchers and specialists within the box of warmth stream, however the booklet can also be invaluable for either working towards engineers and graduate students.

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Additional info for Dynamics of Liquid Solidification: Thermal Resistance of Contact Layer

Example text

Thus, it is necessary to calculate Nusselt number to define the solidification process. When the cylindrical receivers of the interface heat are positioned regularly within the liquid PCM, the results of research on free convection in such geometrical arrangements may be also helpful. The problem of free convection in the mentioned arrangement has been considerably well discussed on the literature. A theoretical analysis of free convection within a vertical arrangement of regularly positioned thin cylinders together with a review of other investigations was presented in the work of Kowalski and Lipnicki (1989).

On the discussed area, there also occurs additional resistance of heat transfer from the warmer to the colder place. The knowledge of thermal resistance in the contact layer is important from practical point of view. It is applicable in metals welding and soldering. Therefore there is need for new theoretical and experimental investigation of this phenomenon. 2 Forced Convection Effects 39 2,5 μ m Fig. 11 Picture of the contact layer in X-rays (Lipnicki 2003) Sn Cu solid solution of tin in copper pure tin following part of this work, a theoretical analysis of solidification of a liquid flowing above a cold plate with variable temperature is presented.

The flowing liquid and the cold plate were separated from each other by the solidified layer. In the result of the solidification, the interface d moves at velocity @d=@t, depending on both the time t and location on the plate. Between the solid body and the stream of the liquid a hydraulic boundary dl and a thermal boundary dt are formed. The beginnings of the boundary layers coincide with the beginning of the plate. Depending on Prandtl number Pr, the hydrodynamic boundary layer can be thicker or thinner than the thermal boundary layer.

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