Experimental visualization of gas–liquid two-phase flow during reciprocating motion

Lv, Jizu; Wang, Peng; Bai, Ming; Li, Gang; Zeng, Ke

doi:10.1016/j.applthermaleng.2015.01.006

Cited by 29 publications

(11 citation statements)

References 5 publications

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“…Oil outlet (e) Schematics of piston cavity oil flow [13] (f) Geometry configuration of piston cavity [13] Fig. 2.…”

Section: Oil Inletmentioning

confidence: 99%

“…The study found that jet cooling reduces the piston temperature by 35-40℃. In 2015, Lv [13] and Wang [14] built a visual test rig with a simplified piston square cavity model (240mm×40mm×40mm) to capture the flow patterns of two-phase flow for oscillation frequencies of 6-14Hz and filling rates of 20-80%, and carefully explored the two-phase flow and heat transfer mechanisms, and found that the filling rate of 40-60% heat transfer efficiency reaches its optimum value. In 2017, Deng [15] split the oscillatory flow and heat transfer process into two sub-test modules and used a transparent rectangular body to observe the two-phase oscillatory flow in the chamber to investigate the effects of injection pressure, engine speed and coolant temperature on the heat transfer performance of the internally cooling chamber.…”

Section: Introductionmentioning

confidence: 99%

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Experimental visualization of the gas-liquid two-phase flow inside the multi-cavity of a real-size marine piston model

Liang

Ming

et al. 2022

Preprint

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In the last decade, the marine industry has been pursuing higher combustion pressure and higher fuel economy, which makes the thermal load on the piston will increase significantly. Therefore, the efficient cooling of the piston is a crucial factor for reliable operation of the diesel engine. There are different types of cooling cavities inside the piston, which is usually cooled by "cocktail shaker" cooling mechanism. In the previous studies, simplified models were mostly used instead of complex actual models, and very few experiments were studied to investigate the multi-cavity with long-strokes, making it a challenge to analyze the gas-liquid two-phase flow in the complex piston cooling cavity. In this paper, a visualization test rig of a real-size marine piston model was built to observe the complex multi-cavity flow by using high-speed camera equipment. Flow mechanism of two-phase flow inside the multi-cavity piston is revealed, the variation of flow patterns with the rotational speed and the filling rate is also studied. It is found that swirl flow exists inside the multi-cavity piston, which was mostly neglected in previous studies. Experimental observations are also verified by extended simulation investigation of the flow field. Results of this paper reveal the full flow mechanism of a typical marine multi-chamber piston, and provide foundation and reference to the cooling mechanism study and optimal design of piston cooling system.

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“…Oil outlet (e) Schematics of piston cavity oil flow [13] (f) Geometry configuration of piston cavity [13] Fig. 2.…”

Section: Oil Inletmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental visualization of the gas-liquid two-phase flow inside the multi-cavity of a real-size marine piston model

Liang

Ming

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In high-temperature and high-pressure drilling, gas-liquid two-phase flow exists widely and its heat transfer mechanism affects the temperature distribution on the drilling fluid surface [10][11]. At present, the research of drilling gas-liquid two-phase flow is mainly based on homogeneous phase model [14], split phase model or drift model. These models mainly consider the axial heat transfer mechanism of drilling fluid, [15] and rarely consider the radial heat transfer mechanism.…”

Section: Study On Heat Transfer Mechanism Of Two-phase Flow In High Tmentioning

confidence: 99%

Mechanism of heat transfer for gas-liquid two-phase flow in deep drilling

Zhong¹,

Peng²,

Jiang³

2018

IJHT

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Drilling fluid cooling technology is one of the key techniques of drilling technology. In order to study the influence of mechanism of drilling fluid on temperature and pressure, especially on thermophysical parameters and rheological properties, as well as the heat transfer mechanism between bubbles and liquid flow inside and outside the liquid film by test, simulation and theoretical research. Firstly, the test on thermophysical parameters of 10 kinds of drilling fluids at 7 different temperatures and 3 different pressure were analyzed, which would provide the key parameters for the establishment of downhole gas-liquid two-phase model. Then, study on rheology of cement slurry under high temperature and high pressure, and its heat transfer equations were derived. The results showed that the specific heat of mud decreases with the increase of density, and the thermal conductivity increases with the increase of density, almost linearly. Besides, gas is the main factor affecting heat transfer inside the well.

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“…During the working process of engine, the piston needs to withstand higher burst pressure and high temperature load. The cooling gallery is a very efficient heat transfer enhancement method, which can effectively deal with the serious thermal load problem of the engine piston [1][2][3]. Steel pistons with cooling gallery are widely being used in commercial automotive engines.…”

Section: Introductionmentioning

confidence: 99%

The influence of welding flash on enhancing heat transfer of steel piston

et al. 2022

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In order to study the influence of welding flash on heat transfer performance of steel piston cooling gallery, the pistons with different structures are studied. In this paper, the finite element simulation calculation of the steel piston with the welding flash and the non-flash structure on the same model and the annular cavity section is carried out separately, and the amount of carbon deposited in the top of the steel piston and cooling gallery after 1000 hours test is measured. The comparative analysis finds that the existence of welding flash hinders the heat transfer of cooling gallery, resulting in an increase in the temperature of the inner surface of cooling gallery, which in turn increases the temperature of entire piston head. Carbon deposits in the top surface and cooling gallery of the steel piston, which affects the cooling effect.

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Experimental visualization of gas–liquid two-phase flow during reciprocating motion

Cited by 29 publications

References 5 publications

Experimental visualization of the gas-liquid two-phase flow inside the multi-cavity of a real-size marine piston model

Experimental visualization of the gas-liquid two-phase flow inside the multi-cavity of a real-size marine piston model

Mechanism of heat transfer for gas-liquid two-phase flow in deep drilling

The influence of welding flash on enhancing heat transfer of steel piston

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