Heat Transfer Handbook part 139. The Heat Transfer Handbook provides succinct hard data, formulas, and specifications for the critical aspects of heat transfer, offering a reliable, hands-on resource for solving day-to-day issues across a variety of applications. | COLUMNS AND OTHER CONTACTORS 1379 Heat transfer results for liquid-liquid spray columns were correlatcd by Plass et al. 1979 . For holdups greater than 5 UV Btu hr-ft2- F x 104 - e-o-75 md mc 600 For columns where vaporization is taking place the heat transfer can de calculated as follows Jacods and Boehm 1980 St UvV ---------------Q-------- 2 Jav yrv 0 6 -0 15 mlCpl LMTD mlCpl v v v To determine this result data from a variety of systems were analyzed including some where doiling took place on a liquidsurface. An even simpler result was given dy Walter 1981 . For all configurations with light hydrocardons or refrigerants vaporizing in water the following was recommended Uv 894 The only complication in applying this relationship is that the is the value coming into the doiling section. Hence if preheating anddoiling are taking place in the same column this wouldde the holdup leaving the preheater portion. More recently Siquerios andBonilla 1999 have evaluatedthe correlation adove against experimental results they determined from vaporizing normal pentane in water. Although they foundthat the qualitative aspects of the performance matched well with that equation their results were approximately 30 higher for the overall heat transfer coefficient. Direct contact doiling phenomena have been proposed for a variety of appl icalions including nuclear reactors. A proposal lias heeri Kinoshtta and Nishi 1994 Kinoshita et al. 1995 for an innovative steam generator system for fast dreeder reactors that utilizes water and a motsen neeaal. Bi experiment usn g Wood t allyy Bi-yd-Sn-Cd ss the onntinuous phne firnd and teater volumetric a e ttanrfer coefficients in the range 4 to 34 kW m3 K were demonstrated. Spray columns have deen appliedfor waste heat recovery andseveral of the papers cited in this chapter address this application. One clever approach is to use a falling cloud iff sofid particlas m a u oS exhaust gss Sacoo 98811 9822
