Direct simulation of spray cooling: Effect of vapor bubble growth and liquid droplet impact on heat transfer

Selvam, R. Panneer; Lin, Lanchao; Ponnappan, Rengasamy

doi:10.1016/j.ijheatmasstransfer.2006.05.009

Cited by 97 publications

(32 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…They observed that the maximum heat flux in terms of the Nusselt number increased with increased convective flow velocity, due to greater mass flow rate of cooler liquid over the heated surface and easy departure of the bubble from the hot surface. Selvam et al [39] used the 2-D computer model to investigate the spray-cooling heat transfer phenomena. The heat transfer characteristics were investigated for two different cases.…”

Section: Numerical Model Reviewmentioning

confidence: 99%

Modeling Thermal-Boundary-Layer Effect on Liquid-Vapor Interface Dynamics in Spray Cooling

Selvam¹,

Sarkar²,

Sarkar³

et al. 2009

Journal of Thermophysics and Heat Transfer

Self Cite

View full text Add to dashboard Cite

Spray cooling is a way of efficiently removing the heat from a hot surface and is considered for high-power systems such as advanced lasers. The heat transfer phenomenon in spray cooling is complex in nature because it occurs due to conduction, convection, and phase change. A brief review of the modeling of spray cooling is presented here. In the present work, the effect of thermal-boundary-layer thickness on liquid-vapor-interface dynamics and its influence on heat transfer in spray cooling is investigated through multiphase-flow modeling. The multiphase-flow modeling is done using the level-set method to identify the liquid-vapor interface. Some modifications to the incompressible Navier-Stokes equations to consider surface tension, viscosity, gravity, and phase change are discussed. The governing equations are solved using the finite difference method. Here, the droplet impact on a growing vapor bubble in a 44-m-thick liquid film is taken as a benchmark problem to represent the spray cooling. The computed liquid-vapor-interface and temperature distributions are also visualized for better understanding of heat removal. In this study, the high-heat-transfer mechanism in spray cooling is explained with systematic illustrations. Nomenclature c p = specific heat at constant pressure, J=kg K Fr = Froude number (u r = p gl r ) g = gravity vector, m=s 2 H = step function h = grid spacing, m h fg = latent heat of evaporation, J=kg Ja = Jacob number (cplT=h fg ) k = thermal conductivity, W=m K l r = characteristic length [ p =g l v ], m m = mass flux vector, g=m 3 =m 2 s m = mass flux Nu = Nusselt number [ql r =Tk l ] n = surface normal Pe = Peclet number ( l u r l r c pl =k l ) Pr = Prandtl number (c pl l =k l ) p = pressure, Pa q = heat flux, W=m 2 Re = Reynolds number ( l u r l r = l )time, s t r = characteristic time (l r =u r ), s u = velocity vector u; v, m=s u = x-direction velocity, m=s u int = interface velocity, m=s u r = characteristic velocity ( p gl r ), m=s v = y-direction velocity, m=s We = Weber number ( l u 2 r l r =) = thermal diffusivity, m 2 =s T = temperature difference (T w T sat ) = interfacial curvature = dynamic viscosity, N s=m 2 = density, g=m 3 = surface tension, N=m ' = level-set function Subscripts int = interface l, v = liquid, vapor r = reference sat = saturation w = wall Superscript * = nondimensional quantity

show abstract

Section: Numerical Model Reviewmentioning

confidence: 99%

Modeling Thermal-Boundary-Layer Effect on Liquid-Vapor Interface Dynamics in Spray Cooling

Selvam¹,

Sarkar²,

Sarkar³

et al. 2009

Journal of Thermophysics and Heat Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…SEC has capability to achieve significantly higher heat flux compared to pool boiling due to reduction in resistance to vapor removal from heated surface. Heat fluxes as high as 10 MW/m 2 with SEC has been reported in [1]. SEC is characterized by uniformity of heat removal and small fluid inventory which makes it an appealing choice for many cooling systems.…”

Section: Introductionmentioning

confidence: 99%

Spray evaporative cooling to achieve ultra fast cooling in runout table

Bhattacharya

Samanta

Chakraborty

2009

International Journal of Thermal Sciences

103

View full text Add to dashboard Cite

“…There are enormous experimental and computational studies that have been conducted to get the overall theoretical understanding and potential application of spray cooling in different fields of technology [4 -6]. Due to the complex nature of the interaction of liquid and vapor phase, liquid impact, and phase change in spray cooling, it is difficult to understand the heat removal phenomena, so overall understanding of spray cooling is still in its infancy [1,2]. Extensive experimental and computational work is still required to get the complete picture of the mechanism underlying the heat transfer phenomena during spray cooling.…”

Section: Introductionmentioning

confidence: 99%

Study on Ultra-fast Cooling Behaviors of Water Spray Cooled Stainless Steel Plates

Aamir

Liu

Zhu

et al. 2015

Experimental Heat Transfer

View full text Add to dashboard Cite

Spray cooling is an effective tool to dissipate high heat fluxes from hot surfaces. This article thoroughly investigates the effect of thickness of a hot stainless steel plate on the cooling time, cooling rate, heat flux, and heat transfer coefficient under constant mass flow rate maintained at 1 MPa using water as the coolant. Cylindrical samples of stainless steel with constant diameter (D 5 25 mm) and thickness (d 5 7.5, 12, 16.5, and 21 mm) were used in the present study. Critical droplet diameter to achieve an ultra-fast cooling rate of 3008C/s was estimated by using an analytical model for samples of varying thicknesses. The analytical model (one side spray cooling) showed good agreement with experimental results with a relative error of 3.2% in the plate thickness range of 1-12 mm. An increasing trend in maximum heat flux was found with increasing thickness of the plate. Maximum heat flux as high as 1,800 kW/m 2 was achieved for a 21-mm-thick sample. Heat transfer coefficients in the range 0.092-96.24 kW/m 2 K, 0.111-98.9 kW/m 2 K, 0.074-63.4 kW/m 2 K, and 0.127-55.63 kW/m 2 K were reported for sample of varying thicknesses in the present study. Limited published work is available with reference to water spray cooling dynamics and thickness of stainless steel plate. Therefore, the present study focuses on the correlation between the thickness of the plate and spray dynamics of water spray cooling.

show abstract

Direct simulation of spray cooling: Effect of vapor bubble growth and liquid droplet impact on heat transfer

Cited by 97 publications

References 24 publications

Modeling Thermal-Boundary-Layer Effect on Liquid-Vapor Interface Dynamics in Spray Cooling

Modeling Thermal-Boundary-Layer Effect on Liquid-Vapor Interface Dynamics in Spray Cooling

Spray evaporative cooling to achieve ultra fast cooling in runout table

Study on Ultra-fast Cooling Behaviors of Water Spray Cooled Stainless Steel Plates

Contact Info

Product

Resources

About