Optimal spray characteristics in water spray cooling

    Authors

    R. H. Chen; L. C. Chow;J. E. Navedo

    Comments

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    Abbreviated Journal Title

    Int. J. Heat Mass Transf.

    Keywords

    boiling; critical heat flux; droplet; efficiency; scaling; spray; Thermodynamics; Engineering, Mechanical; Mechanics

    Abstract

    The dependence of the efficiency of liquid usage (eta) at CHF on spray parameters was experimentally investigated for subcooled water spray cooling. A spray can be characterized by three independent parameters (droplet Sauter-mean diameter, d(32), droplet velocity, V, and droplet flux, N). In this study, each of these parameters was varied with the other two kept constant by using a combination of spray nozzles, operating pressures, and distance between the nozzle exit and the heater surface. It was found that eta varies with N-2/3, d(32)(-14/5) and V-1/4, respectively, when two of the three spray parameters are kept nearly constant. It was also found that CHF varies with N-1/16 and V-1/4 and is relatively independent of d(32). It is concluded that to achieve the maximum possible CHF while using the minimum quantity of water, it is desirable to select nozzles that produce as small a droplet diameter with as high a velocity as possible. (C) 2004 Elsevier Ltd. All rights reserved.

    Journal Title

    International Journal of Heat and Mass Transfer

    Volume

    47

    Issue/Number

    23

    Publication Date

    1-1-2004

    Document Type

    Article

    Language

    English

    First Page

    5095

    Last Page

    5099

    WOS Identifier

    WOS:000224450100013

    ISSN

    0017-9310

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