Boiling and Condensation

May 7th, 2015
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A SHORT INTRODUCTION TO TWO-PHASE FLOWS Condensation and boiling heat transfer Herv´ Lemonnier e DM2S/STMF/LIEFT, CEA/Grenoble, 38054 Grenoble Cedex 9 Ph. +33(0)4 38 78 45 40, herve.lemonnier@cea.fr herve.lemonnier.sci.free.fr/TPF/TPF.htm ECP, 2011-2012HEAT TRANSFER MECHANISMS• Condensation heat transfer: – drop condensation – film condensation • Boiling heat transfer: – Pool boiling, natural convection, ´bullition en vase e – Convective boiling, forced convection, • Only for pure fluids. For mixtures see specific studies. Usually in a mixture, h xi hi and possibly hi . • Many definitions of heat transfer coefficient, q , h[W/m /K] = ∆T 2

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Boiling and CondensationA SHORT INTRODUCTION TO TWO-PHASE FLOWS Condensation and boiling heat transfer Herv Lemonnier e DM2S/STMF/LIEFT, CEA/Grenoble, 38054 Grenoble Cedex 9 Ph. +33(0)4 38 78 45 40, herve.lemonnier@cea.fr herve.lemonnier.sci.free.fr/TPF/TPF.htm ECP, 2011-2012HEAT TRANSFER MECHANISMS Condensation heat transfer: drop condensation lm condensation Boiling heat transfer: Pool boiling, natural convection, bullition en vase e Convective boiling, forced convection, Only for pure uids. For mixtures see specic studies. Usually in a mixture, h xi hi and possibly hi . Many denitions of heat transfer coecient, q , h[W/m /K] = T 2hL Nu = , kk(T ?)Condensation and boiling heat transfer1/42CONDENSATION OF PURE VAPOR Flow patterns Liquid lm owing. Drops, static, hydrophobic wall ( ). Clean wall, better htc. Fluid mixture non-condensible gases: Incondensible accumulation at cold places. Diusion resistance. Heat transfer deteriorates. Traces may alter signicantly hCondensation and boiling heat transfer2/42FILM CONDENSATION Thermodynamic equilibrium at the interface, Ti = Tsat (p ) Local heat transfer coecient, h(z) q q = T i Tp Tsat Tp Averaged heat transfer coecient, h(L) 1 LLh(z)dz0 NB: Binary mixtures Ti (x , p) and p (x , p). Approximate equilibrium conditions, For

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