Correlation models of critical heat flux and associated temperature for spray evaporative cooling of vibrating surfaces

Sarmadian, Alireza, Dunne, J F, Thalackottore Jose, J, Long, C A and Pirault, J-P (2021) Correlation models of critical heat flux and associated temperature for spray evaporative cooling of vibrating surfaces. International Journal of Heat and Mass Transfer, 179. a121735 1-20. ISSN 0017-9310

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Prediction models have been constructed to investigate the effect of vibrating surfaces on the critical heat flux (CHF) and its associated temperature in spray evaporative cooling. Dimensional analysis has been used to construct the models to account for the influence of key dynamic parameters. Experimental measurements have been obtained from a flat, electrically-heated, copper test-piece, located inside a spray-chamber mounted on top of a shaker. A wide range of large-amplitude and high-frequency measurements have been obtained which correspond to test conditions for a piece of hardware mounted on board a light-duty automotive vehicle with vibration amplitudes ranging from 0 to 8 mm and frequencies from 0 to 200 Hz. Three nozzle types have been fed with distilled water at flow rates ranging from 55 to 100 ml/min being used to cool with subcooling degrees ranging from 10°C to 45°C. Measured data for both static and dynamic cases have been used to explore the influence on the CHF and the surface-to-fluid saturation temperature at which this occurs, of subcooling degrees, surface vibration amplitude and frequency, vibrational Reynolds Number and vibrational Acceleration Number. The measured data has also subsequently been used to calibrate the predictive models for use in thermal management systems. Static measurements (without vibration) show that the influence of flow rate, volumetric flux, and subcooling are largely in agreement with published literature. For dynamic cases, the influence of vibration is best explained in terms of the nondimensional parameters: Vibration Reynolds Number and Acceleration Number. The effect of vibration on CHF and associated temperature is assessed in detail for the three nozzle types at different flow rates and degrees of subcooling. Predictions of CHF and associated excess temperature, using the calibrated correlation models for the dynamic conditions, are very reasonable, and suitable for the intended purpose of ensuring safe operation of thermal management systems using spray evaporative cooling.

Item Type: Article
Keywords: Spray evaporative cooling, Critical Heat Flux, Vibrating surfaces, Hardware based experimental verification, Automotive and aerospace
Schools and Departments: School of Engineering and Informatics > Engineering and Design
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 28 Jul 2021 07:05
Last Modified: 01 Mar 2022 10:57

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Project NameSussex Project NumberFunderFunder Ref
Evaporative Cooling of Internal Combustion EnginesG1473EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILUnset
Evaporative Cooling of Internal Combustion Engines (Follow On)G2831RICARDOUnset