991 0991 figure 1052 variation of temperature in the

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Unformatted text preview: is formulated in two dimensions, with all faces insulated, except the face representing the liquid surface. The latent heat effect (accompanying change in phase from liquid to solid), is approximated by specifying a rapid variation in enthalpy (material property ENTH), over the “mushy” zone in a temperature range of ∆T (taken as 1.0°C). The enthalpy (H) variation is computed from the equation H = ρc dT. An adjusted specific heat of Lf/∆T = 42000.0 J/kg-°C, is used in the freezing zone, resulting in a slope discontinuity, as shown in Figure 104.3: “Temperature Distribution at Time = 501 Seconds”. For the given case, a time step of 3.0 seconds is found to be adequate to give more than one time step through the freezing zone. Automatic time stepping is used. POST1 is used to obtain the temperature distribution through the two phases and POST26 is used to display the temperature history of points in each of the phases. Figure 104.2 Enthalpy vs. Temperature 12 )0'(%&$ 3) 1 ) pY g$ i hf `aQ Y¥X e2d5 c ¤¥¢ § ¨ ¤¥¢ §¨¢...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

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