Droplet evaporation with reference to the effectiveness of water-mist cooling

Barrow, H.; Pope, C W

doi:10.1016/j.apenergy.2006.09.007

Cited by 67 publications

(32 citation statements)

References 1 publication

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“…For instance, liquid spray cooling has received significant research attention as a high-heat-flux thermal management technology [2][3][4][5][6][7]. Mist impingement cooling is a variant of spray cooling wherein a two-phase mixture of finely dispersed liquid droplets in air is sprayed onto a hot surface [8][9][10][11][12][13][14]. It should be noted that the high heat-dissipation capacity of spray cooling-based technologies is primarily a result of direct contact of the cooling fluid with the hot surface and subsequent evaporation of the liquid at the surface.…”

Section: Introductionmentioning

confidence: 99%

Analysis of evaporating mist flow for enhanced convective heat transfer

Kumari

Bahadur

Hodes

et al. 2010

International Journal of Heat and Mass Transfer

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a b s t r a c tEnhancement of forced convective heat transport through the use of evaporating mist flow is investigated analytically and by numerical simulation. A two-phase mist, consisting of finely dispersed water droplets in an airstream, is introduced at the inlet of a longitudinally-finned heat sink. The latent heat absorbed by the evaporating droplets significantly reduces the sensible heating of the air inside the heat sink which translates into higher heat-dissipation capacities. The flow and heat transfer characteristics of mist flows are studied through a detailed numerical analysis of the mass, momentum and energy transport equations for the mist droplets and the airstream, which are treated as two separate phases. The coupling between the two phases is modeled through interaction terms in the transport equations. The effects of inlet mist droplet size and concentration on the thermal performance of the heat sink are analyzed parametrically. The results provide insight into the complex transport processes associated with mist flows. The simulations indicate that significantly higher heat transfer coefficients are obtained with mist flows as compared to air flows, highlighting the potential for the use of mist flows for enhanced thermal management applications.

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Section: Introductionmentioning

confidence: 99%

Analysis of evaporating mist flow for enhanced convective heat transfer

Kumari

Bahadur

Hodes

et al. 2010

International Journal of Heat and Mass Transfer

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“…(2), (4), (5), (11), (12) and (13). The first three equations are PDE with respect to time and space.…”

Section: Figure 3 Heat Transfer Between Air and Water Droplets As Wementioning

confidence: 99%

“…However, the presence of significant liquid volume in the piston chamber must also be accommo-dated. A simple theoretical analysis of a single droplet transport phenomena in humid air and the prediction of the life time of a freely-falling droplet is investigated in [13]. A descriptive mathematical model for energy and exergy analysis is presented in [14] for a co-current gas spray cooling system.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Trajectory Optimization of Water Spray Cooling in a Liquid Piston Air Compressor

Saadat

Shirazi

2013

Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer In

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“…, v s ρ is the vapor density at the droplet surface and , v ρ ∞ is the vapor density in the ambient air [16]. The steady-state Sherwood number [Sh = h m D/D AB ] for pure diffusion takes a value of 2 [17] and mass transport is assumed to be quasi-steady.…”

Section: Droplet Evaporation Modelmentioning

confidence: 99%

Enhanced cooling in a sealed cabinet using an evaporating-condensing dielectric mist

Bahadur

Hodes²,

Lyons³

et al. 2008

2008 11th Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems

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Many factors, such as acoustic noise limits and fan reliability considerations, limit the heat dissipation capacity of air-cooled cabinets housing telecommunications or computing hardware. The present work examines the potential of enhanced cooling in a sealed telecommunications cabinet using an evaporatingcondensing dielectric mist introduced upstream of heat sinks attached to high-power components in a circuit pack, or at the inlet to the circuit packs. The conceptualized system is of a two-component (air and dielectric fluid) and two-phase nature, wherein droplets of mist are dispersed within the air circulating through a sealed cabinet. The evaporated mist is condensed at the outlet of the circuit packs in a cabinet and recycled back to their inlets. First-order models of the mist flow through a heat sink are developed to estimate its influence on flow and heat transfer. The optimum droplet diameter and the optimum mist concentration are obtained from these models for representative conditions. Moreover, the models are used to obtain a first-order estimate of the heat dissipation capacity and the pressure drop required for sustaining the mist flow. The results show that the proposed mist cooling approach offers significant promise for providing high-flux heat removal solutions for sealed cabinets in telecommunications central offices and data centers. A cross-sectional area of the heat sink, m 2 D droplet diameter, m h m mass transfer coefficient, m/s m mass of a single droplet, kg . m mass flow rate through the heat sink, kg/s n number of moles p pressure, Pa t time, s v velocity, m/s x axial distance along heat sink, m D AB mass diffusion coefficient, m 2 /s Ja Jacob number Re Reynolds number RH relative humidity Sc Schmidt number Sh Sherwood number .

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Droplet evaporation with reference to the effectiveness of water-mist cooling

Cited by 67 publications

References 1 publication

Analysis of evaporating mist flow for enhanced convective heat transfer

Analysis of evaporating mist flow for enhanced convective heat transfer

Modeling and Trajectory Optimization of Water Spray Cooling in a Liquid Piston Air Compressor

Enhanced cooling in a sealed cabinet using an evaporating-condensing dielectric mist

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