Direct-Contact Heat Transfer by Frank Kreith, R.F. Boehm

By Frank Kreith, R.F. Boehm

to raise using direct touch methods, the nationwide technological know-how starting place sup­ ported a workshop on direct touch warmth move on the solar power learn Insti­ tute in the summertime of 1985. We served as organizers for this workshop, which em­ phasized a space of thermal engineering that, in our opinion, has nice promise for the longer term, yet has no longer but reached the purpose of time-honored advertisement program. consequently, a precis of the nation of information at this aspect is well timed. The workshop had a twin goal: 1. To summarize the present kingdom of information in one of these shape that business practi­ tioners could make use of the on hand info. 2. to point the examine and improvement had to boost the state of the art, indicating not just what sort of study is required, but in addition the commercial poten­ tial which may be learned if the data to be acquired in the course of the proposed examine actions have been available.

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Specific research needs include the following: 1. Better characterization of the new "high efficiency packings," such as the structured packings of the gauze and sheet-metal type, with respect to heat and mass transfer capabilities. Some of this work is in progress, but is restricted to mass transfer. 2. Further work on the applicability of the heat transfer/mass transfer analogy to gas-liquid contacting that includes significant amounts of heat transfer, taking into account varying system properties as well as device geometries.

More recently, Barile et al. (1974) have reported on the performance of a "turbulent bed cooling tower" employing a fluidized bed of hollow spheres. 2 Spray Columns Spray chambers are convenient for direct-contact heat transfer operations and are simple in design, containing as internals only one or more banks of spray nozzles. Pressure drop for flow of gas is minimal. Heat-transfer efficiency suffers, however, 34 DIRECT-CONTACT HEAT TRANSFER from deterioration of spray pattern as distance from the nozzles increases and the large degree of backmixing of the gas caused by the impact of the spray droplets.

Liquid-liquid a. Immiscible systems 3. Liquid-liquid-gas Hot oil cooling; preheating water for desalination Desalinating water; quenching water-containing gas with oil 4. Gas-gas Blending streams of unequal temperatures B. Fluid-solid 1. Gas-solid a. Solids heating/gas cooling Calcining; adsorbent regeneration b. Solids cooling/gas heating Regenerative heating of gas; moving bed contacting; fiuid-bed contacting 2. Liquid-solid Metal quenching 3. Liquid-gas-solid Prilling; spray drying; hot gas quenching by a slurry C.

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