Effect of surface material properties and surface characteristics in evaporative spray cooling

In the spray cooling of a heated surface, Variations in the surface contact angle cause a change in nucleation characteristics and, thereby, influence the heat transfer process; a higher contact angle shows an enhanced heat transfer due to the ease in nucleation caused by the lowered free energy associated with bubble formation. Results are presented for different surface coatings and spray configurations. The surface roughness variation influences the flowfield, altering the maximum liquid film thickness, the bubble diameter, vapor entrapment, bubble departure characteristics, and, thereby, the ability of the surface to transfer heat. The effect of surface roughness on spray cooling is also studied.

[1]  P. J. Berenson.  Experiments on pool-boiling heat transfer , 1962 .

[2]  H. Edgerton,et al.  Stopping Time: The Photographs of Harold Edgerton , 1987 .

[3]  A Fourier analysis approach for surface definition and the effect of roughness on the local convective heat-transfer coefficient as related to ice accretion , 1988 .

[4]  R. Mesler,et al.  A mechanism supported by extensive experimental evidence to explain high heat fluxes observed during nucleate boiling , 1976 .

[5]  Y. Hsu.  On the Size Range of Active Nucleation Cavities on a Heating Surface , 1962 .

[6]  M R Pais,et al.  Determination of the Local Heat Transfer Characteristics on Glaze Ice Accretions on a Cylinder and a NACA 0012 Airfoil. , 1987 .

[7]  R. Mesler,et al.  Vaporization at the base of bubbles of different shape during nucleate boiling of water , 1969 .

[8]  P. J. Berenson.  Film-Boiling Heat Transfer From a Horizontal Surface , 1961 .

[9]  B. Jerome.  Transition boiling heat transfer from a horizontal surface , 1960 .

[10]  M. Maracy,et al.  Hysteresis and contact angle effects in transition pool boiling of water , 1988 .

[11]  George G. Lendaris,et al.  Diffraction-pattern sampling for automatic pattern recognition , 1970 .

[12]  M. Cooper,et al.  A general expression for the rate of evaporation of a layer of liquid on a solid body , 1973 .

[13]  Ilya Prigogine,et al.  Surface tension and adsorption , 1966 .

[14]  L. Zou,et al.  Determination of the local heat-transfer characteristics on simulated smooth glaze ice accretions on a NACA 0012 airfoil , 1988 .

[15]  S. Bankoff.  Entrapment of gas in the spreading of a liquid over a rough surface , 1958 .

[16]  S. Liaw,et al.  EFFECT OF SURFACE WETTABILITY ON TRANSITION BOILING HEAT TRANSFER FROM A VERTICAL SURFACE , 1986 .

[17]  S. M. You,et al.  Contact angle effects on boiling incipience of highly-wetting liquids , 1990 .

[18]  P. D. Lebedev,et al.  Liquid boiling in a thin film , 1969 .

[19]  J. E. Myers,et al.  The effects of superheat and surface roughness on boiling coefficients , 1960 .

[20]  R. Mesler,et al.  A STUDY OF NUCLEATE BOILING NEAR THE PEAK HEAT FLUX THROUGH MEASUREMENT OF TRANSIENT SURFACE TEMPERATURE , 1977 .

[21]  R. Webb.  The Evolution of Enhanced Surface Geometries for Nucleate Boiling , 1981 .

[22]  P. Griffith,et al.  THE ROLE OF SURFACE CONDITIONS IN NUCLEATE BOILING. Technical Report No. 14 , 1958 .

[23]  John A. Clark,et al.  Momentum and Heat Transfer in Laminar Flow of Gas With Liquid-Droplet Suspension Over a Circular Cylinder , 1967 .

[24]  S. Yao,et al.  Mechanisms of film boiling heat transfer of normally impacting spray , 1987 .

[25]  L. Chow,et al.  High-heat-flux, low-superheat evaporative spray cooling , 1989 .