Computational fluid dynamics assessment of subcooled flow boiling in internal-combustion engine-like conditions at low flow velocities with a volume-of-fluid model and a two-fluid model

Torregrosa, A.J.; Olmeda, Pablo; Gil, Antonio; Cornejo, Omar

doi:10.1177/0954407015571674

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…Therefore, information of typical bubble diameters and their distribution for given operating conditions is required. Additionally, the bubble size distribution and the bubble departure diameter provide important closure relationships for the numerical prediction of subcooled boiling flows (Tu and Yeoh 2002;Torregrosa et al 2015).…”

Section: Introductionmentioning

confidence: 99%

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Torregrosa

Broatch

Olmeda

et al. 2016

JAFM

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Current trends in engine design indicate the necessity to take advantage of the highest rates of heat transfer associated with nucleate boiling, mostly at high engine loads. When used in conjunction with advanced thermal management strategies, subcooled boiling may take place at very low velocities, for which little information is available, and in ducts with small cross-sectional area, so that undesired effects of the relative sizes of ducts and bubbles may appear. In this paper, experiments on subcooled boiling flow at low velocities and engine-like temperature conditions were conducted with a usual engine coolant. A high-speed photographic camera was used to collect images of the detached vapor bubbles, and the microscopic characteristics of the heating surface were determined. Experimental results for the mean values show acceptable agreement with the results of a mechanistic radius model, when assuming that departure and lift-of radius are related through the flow boiling suppression factor. Additionally, the results obtained are compatible with the sizes of the nucleation sites estimated from the surface characterization. The results obtained for the size distribution are consistent with those found in the literature.

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Section: Introductionmentioning

confidence: 99%

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Torregrosa

Broatch

Olmeda

et al. 2016

JAFM

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“…In a highland environment, as the altitude rises, the atmospheric pressure drops and so does the saturation temperature of the cooling water. so the cooling system should have two forms of heat transfer, one for simple oneway fluid convection heat transfer, and the other for twophase flow boiling heat transfer [6]. Consequently, it will be of great importance to research the variation of supercooled boiling point heat transfer characteristics of PMSM in electric vehicles under the special plateau environment, which can enhance the efficiency of PMSM in the plateau environment.…”

Section: Introductionmentioning

confidence: 99%

Temperature rise characteristics of permanent magnet synchronous motor considering boiling heat transfer

He,

Feng,

Zhang

et al. 2023

Electr Eng

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The temperature rise characteristics of PMSM (permanent magnet synchronous motor) during operation were studied under the condition of BHT (boiling heat transfer) in cooling water. The subcooling boiling heat transfer model, RPI (Rensselaer polytechnic institute), was used to calculate and improve the computational accuracy of simulation results. The experiments have shown that, when the motor was tested and simulated after preheating, the temperature rise characteristics were similar to test data because the boiling heat transfer phenomenon of the motor was taken into account, with an error of 1.7 %, which was more accurate than the error of 7.5 % without boiling. Therefore, from the results obtained from the experiments, the phenomenon of boiling heat transfer in cooling system has a significant effect on the temperature rise characteristic of the motor, which should be regarded as an important factor. Due to the influence of two-phase flow boiling heat transfer, the temperature rise of the motor in the plain areas is 4-5 ℃ higher than that in the high altitude areas, Consequently, if the motor is operated in high altitude areas, its temperature rise characteristic has better effect compared with plain area. Additionally, when BHT in cooling water is considered, the temperature of the motor drops as the rate of flow increases. In the meantime, the temperature difference between the minimum flow rate and the maximum flow rate is about 1 ℃, which means that the increase of rate of flow can enhance the boiling heat transfer effect. KeywordsPermanent magnet • Synchronous motor • Temperature field • Boiling heat transfer • Two-phase flow • Plateau environment

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Experimental study on bubble size distribution of subcooled flow boiling in cylinder head of internal combustion engines

Cao

Hou

et al. 2019

J Mech Sci Technol

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Computational fluid dynamics assessment of subcooled flow boiling in internal-combustion engine-like conditions at low flow velocities with a volume-of-fluid model and a two-fluid model

Cited by 4 publications

References 28 publications

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Temperature rise characteristics of permanent magnet synchronous motor considering boiling heat transfer

Experimental study on bubble size distribution of subcooled flow boiling in cylinder head of internal combustion engines

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