Spray Cooling with Mixtures of Dielectric Fluids

Ashwood, Andrea C.; Shedd, Timothy A.

doi:10.1109/stherm.2007.352414

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…The influence of the ratio of convective to conductive heat transfer upon the surface is represented by Nusselt number Nu. Equations (11)- (14) defines Re, Pr, and Nu, respectively. The parameter D s in Equation (11) represents the projection diameter of spray on the heat transfer surface which is described in Figure 9 and calculated by Equation (14).…”

Section: Experimental Dimensionless Correlationmentioning

confidence: 99%

“…For the purpose of enhancing the heat dissipation capacity of SCS, tremendous efforts regarding the complicated heat transfer mechanisms have been carried out through both numerical simulation studies and experimental investigations in different conditions. Many parameters affect the thermal performance such as arrangement of multi-nozzle [5], heat transfer surface roughness [6], coolant type [12][13][14], spray flow rate [13,[15][16][17], spay height [18], spray angle [19], nozzle inlet pressure [20], droplet size [21], impact velocity [22], gravity [4,23], target surface structure [24][25][26][27], and sub-cooling degree [28,29], which all have been contributed to the variation in behavior of spray cooling technology. Furthermore, each of the factors is mutual interference and restriction [7], for instance, the factors of droplet size, impact velocity, spray angle, even the spray flow rate would change as the variation of the nozzle inlet pressure.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Heat Transfer Mechanism of Air-Blast-Spray-Cooling System with a Two-Phase Ejector Loop for Aeronautical Application

Cai

et al. 2019

Energies

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This paper presents an air-oriented spray cooling system (SCS) integrated with a two-phase ejector for the thermal management system. Considering its aeronautical application, the spray nozzle in the SCS is an air-blast one. Heat transfer performance (HTP) of air-water spray cooling was studied experimentally on the basis of the ground-based test. Factors including pressure difference between water-inlet-pressure (WIP) and spray cavity one (PDWIC) and the spray volumetric flow rate (SVFR) were investigated and discussed. Under a constant operating condition, the cooling capacity can be promoted by the growth factors of the PDWIC and SVFR with the values from 51.90 kPa to 235.35 kPa and 3.91 L ⋅ h − 1 to 14.53 L ⋅ h − 1 , respectively. Under the same heating power, HTP is proportional to the two dimensionless parameters Reynolds number and Weber number due to the growth of droplet-impacting velocity and droplet size as the increasing of PDWIC or SVFR. Additionally, compared with the factor of the droplet size, the HTP is more sensitive to the variation in the droplet-impacting velocity. Based on the experimental data, an empirical experimental correlation for the prediction of the dimensionless parameter Nusselt number in the non-boiling region with the relative error of only ± 10 % was obtained based on the least square method.

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Section: Experimental Dimensionless Correlationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Heat Transfer Mechanism of Air-Blast-Spray-Cooling System with a Two-Phase Ejector Loop for Aeronautical Application

Cai

et al. 2019

Energies

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show abstract

“…Although several experiments have been conducted, and various designs of spray cooling devices are emerging in recent years [1,[3][4][5][6][7][8], theoretical understandings of spray cooling are still limited due to the intrinsic complexity of involved mechanisms. Little comprehensive models have been established for the spray cooling heat transfer.…”

Section: Review Of Modeling Of Spray Coolingmentioning

confidence: 99%

Modeling and Experimental Research on Spray Cooling

Jia

Guo²,

Wang

et al. 2008

2008 Twenty-Fourth Annual IEEE Semionductor Thermal Measurement and Management Symposium

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As a promising solution for high heat flux applications, spray cooling has been widely studied in recent years. A little theoretical knowledge for the heat transfer mechanism of spray cooling is applied to practical design. In order to obtain a better understanding of spray cooling, models of the thickness and the temperature distribution within the range of the impact area were established considering the micro-scale phenomena, such as velocity slip and temperature jump. The heat transfer coefficient (HTC) was calculated. An experimental apparatus was set up to validate the HTC in the models. Experiments were performed for a commercial pressurized full cone nozzle using distilled water as the working fluid. The maximum error between the experimental HTC and the simulated HTC is within 16%.

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“…Some of them also found a dependence on Weber number [4] [5] and the ratio of wall temperature to saturation temperature [4] [5] [6]. Most of the research was done with water [7] [4] [8] or fluor compounds [9]. That is why the Prandtl number was only investigated in a small range.…”

Section: Introductionmentioning

confidence: 99%

“…That is why the Prandtl number was only investigated in a small range. Two paper covering different fluids are Rybicki et al [10] and Ashwood et al [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Influences of Fluid Properties on Heat Transfer for Spray Cooling

Kansy¹,

Kalmbach²,

Loges³

et al. 2020

World Congress on Momentum, Heat and Mass Transfer

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With electrification of the power train, spray cooling becomes more and more important for automobile applications and its electronic components. That's why this investigation focuses on heat transfer performance of spray cooling under automobile boundary conditions. These conditions include wall temperatures below boiling temperature of the fluid, small nozzle to target distances, low nozzle pressures and a vertically positioned target. In order to enable direct contact of the fluid with the electronic components, electrically insulating fluids need to be used. The properties of these dielectric fluids vary in a wide range. Hence this investigation puts special emphasis on the influence of fluid properties on spray cooling. As working medium, water and two water-glycerol mixtures at different temperatures were used to imitate viscosities of exemplary dielectric fluids. The investigated Prandtl numbers range between 5 and 328. To measure heat transfer, an experimental setup based on a steady-state measurement principle was used. A Nusselt correlation, depending on Prandtl and Reynolds number is proposed. The measurement results of heat transfer showed an almost linear dependency on mass flow rate, when spray droplets were impinging on the target. For lower Reynolds numbers, where no spray forms, but an impinging jet sustains, lower heat transfer is observed and the linear dependency does not hold. The droplet size seems to have a negligible effect on heat transfer.

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Spray Cooling with Mixtures of Dielectric Fluids

Cited by 10 publications

References 2 publications

Experimental Investigation on Heat Transfer Mechanism of Air-Blast-Spray-Cooling System with a Two-Phase Ejector Loop for Aeronautical Application

Experimental Investigation on Heat Transfer Mechanism of Air-Blast-Spray-Cooling System with a Two-Phase Ejector Loop for Aeronautical Application

Modeling and Experimental Research on Spray Cooling

Experimental Investigation of the Influences of Fluid Properties on Heat Transfer for Spray Cooling

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