Active performance enhancement of spray cooling

Pavlova, Anna; Otani, Kiyoshi; Amitay, Michael

doi:10.1016/j.ijheatfluidflow.2008.02.006

Cited by 24 publications

(10 citation statements)

References 36 publications

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“…Contrary to the heat conduction assumption in the boundary layer analogy expressed by equation (2), in the correlation above, spray impingement heat transfer is governed by the single-phase convection of the liquid film and the inertial impact exerted by the spray droplets on the heated surface. Rybicki and Mudawar [8] derived such correlation for spray cooling with a ¼ 4.7, b ¼ 0.32 and c ¼ 0.61.…”

Section: Review On the Development Of Heat Transfer Correlations For mentioning

confidence: 98%

“…Recently, the application of an intermittent spray in thermal management systems has been proposed as a new technological concept for the enhancement of heat transfer, providing the system with an improved performance, as well as an active control over heat transfer mechanisms [1]. From another point of view, further enhancements in spray cooling technology have been suggested implying the active control of the spray characteristics using synthetic-jets [2]. This emphasizes a current trend in the development of efficient spray cooling systems by introducing a 'control' component in the system's design.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer correlation for intermittent spray impingement: A dynamic approach

Panão

Moreira

2009

International Journal of Thermal Sciences

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Section: Review On the Development Of Heat Transfer Correlations For mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Heat transfer correlation for intermittent spray impingement: A dynamic approach

Panão

Moreira

2009

International Journal of Thermal Sciences

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“…However, the SMD become larger as the WIP increasing when the AIP under a constant condition, which is demonstrated in Figure 5. As a result, both the two dimensionless parameters Reynolds number Re and Weber number We, which are calculated by Equation (5) [42] and (6) [18] respectively, are increased with the growth of WIP. Under the same heating power, the heat dissipation capacity of spray cooling is proportional to Re and We.…”

Section: Effects Of Pdwicmentioning

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%

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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“…High effort is done in research in homogeneous water distribution over a wide range of operation parameters (varying water flow rate, air pressure e.g.) [1][2][3], nevertheless heat transfer coefficients (HTC) can still differ over spray width, leading to uneven heat removal during casting. [4][5][6][7] Mean heat transfer coefficients based on adjusted water impact densities [8][9][10][11] are commonly used to describe the heat removal in the secondary cooling zone in continuous casting process simulations, aiming on simplicity and calculation speed.…”

Section: Introductionmentioning

confidence: 99%

Experimental und numerical investigations on cooling efficiency of Air-Mist nozzles on steel during continuous casting

Arth

Taferner

Bernhard

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Cooling strategies in continuous casting of steel can vary from rapid cooling to slow cooling, mainly controlled by adjusting the amount of water sprayed onto the surface of the product. Inadequate adjustment however can lead to local surface undercooling or reheating, leading to surface and inner defects. This paper focuses on cooling efficiency of Air-Mist nozzles on casted steel and the experimental and numerical prediction of surface temperature distributions over the product width. The first part explains the determination of heat transfer coefficients (HTC) on laboratory scale, using a so called nozzle measuring stand (NMS). Based on measured water distributions and determined HTC's for air-mist nozzles using the NMS, surface temperatures are calculated by a transient 2D-model on a simple steel plate, explained in the second part of this paper. Simulations are carried out varying water impact density and spray water distribution, consequently influencing the local HTC distribution over the plate width. Furthermore, these results will be interpreted with regard to their consequence for surface and internal quality of the cast product. The results reveal the difficulty of correct adjustment of the amount of sprayed water, concurrent influencing water distribution and thus changing HTC distribution and surface temperature.

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Active performance enhancement of spray cooling

Cited by 24 publications

References 36 publications

Heat transfer correlation for intermittent spray impingement: A dynamic approach

Heat transfer correlation for intermittent spray impingement: A dynamic approach

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

Experimental und numerical investigations on cooling efficiency of Air-Mist nozzles on steel during continuous casting

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