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By A.S. Mujumdar and R.A. Mashelkar (Eds.)

The subject material coated during this quantity covers a large scope. It includes severe studies in lots of frontier components of curiosity to engineers and utilized scientists. Multiphase shipping starting from floc breakage to stream via multiphase media is mentioned. tough difficulties of bubble progress and devolatilisation from polymeric melts are handled. The query of solid-liquid section switch with circulation is taken into account and the rising quantitation of net drying know-how via mathematical modeling is roofed. shipping phenomena in high-tech fabrics starting from zeolite catalysts to liquid crystalline fabrics are lined and bold difficulties of delivery of gases in porous media, that have implications in lots of diverse applied sciences, also are addressed. ultimately, functions of more recent recommendations in numerical computation of shipping strategies are highlighted.

These authorative, evaluative and well timed reports of subject matters of present and power curiosity will serve the wishes of working towards engineers in addition to educational and commercial researchers

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1 2 a n d 13. I n F i g . 49x 1 0 , the convection modest m a n n e r as the boundary shape changes. 49 χ 1 0 ~ , however, not only is the convection strength affected substantially by the modest boundary shape perturbation, but also the convection field experiences a qualitative change in characteristics. It is noted that the dominant convection cell is largely dictated by the temperature field and the solute induced convection cells n o w all but disappear (Shyy and C h e n 1991 b). It appears that it is the Lewis n u m b e r that mostly controls the sensitivity of the convection characteristics with respect to the boundary shape variations.

2. Case Studies To give an overview of the work in progress, a reservoir flow and heat transfer simulation will be presented. T h e reservoir chosen is axisymmetric with distributed thermal boundary 45 conditions, as schematically illustrated in Fig. 20. A l o n g part of the cylinder walls, a p o r o u s wick m a d e of a l u m i n u m or stainless steel screen is p l a c e d to create a temperature dependent surface tension. U n d e r microgravity conditions, and in the absence of forced convection, the reservoir regulates the thermal field of the loop largely via thermocapillary convection and p h a s e change.

Flemings 1974, Glicksman et al. 1986). Extensive efforts have been devoted to developing suitable physical models and computational techniques to better understand transport processes in presence of phase change. In terms of physical m o d e l s , different treatments can be m a d e to account for the presence of the m u s h y zone between the solidus and the liquidus p h a s e s (Flemings 1974, Ganesan and P o k i e r 1990, Yao and Prusa 1989). T h e r e are also relative advantages and disadvantages b e t w e e n adopting the temperature and the enthalpy as the primary variables in the energy equation (Yao and Prusa 1989, Crank 1984, Viskanta 1989).

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