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The pressurization in a solidifying sphere of molten material (initially at a uniform melting temperature) immersed in an infinite cooling medium is presented. The steady-state approximate solution applied to the heat-conduction problem with change of phase (the Stefan problem) provides the temperature distribution in the shell and rate of solidification, which can be employed in the evaluation of the pressurization stress and thermal stress distributions in the solid shell. Stress distributions are evaluated and plotted in dimensionless form. Additional results are presented for the specific case of aluminum alloy.

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The energy conversion conjugate conduction-convection Ohmic mixed heat and mass transfer of an incompressible viscoelastic fluid on thermal forming stretching sheet has been studied. The present study has been applied similarity transformation method to change the partial differential equations transform to a set of nonlinear ordinary differential equations, and it has also been used an implicit finite-difference method to solve the system's equations. The numerical calculating results for the conjugate heat transfer energy conversion problem which have been carried out as functions of viscoelastic number E, Prandtl number Pr and buoyancy parameter Gr, Gc, etc. The parameters of E, E1, Gr, Gc and Pr are important energy conversion factors in this study, it should be produced greater heat transfer energy conversion effect with a larger values of E, E1, Gr, Gc or Pr, but the parameter M or Ec will be reduced the heat transfer energy conversion effect. For mass transfer energy conversion processing, the Schemidt number Sc or reaction parameter Rc will be increased the mass transfer energy conversion effects. For heat conduction energy conversion aspect, the convection-conduction number Ncc will be increased the heat conduction energy conversion effect. Because of present study has been studied about many parameters physical features, so that it is also belong to a multimedia physical feature study work.

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