An investigation of a mixed convection in a ⊔ shape channel moving with a reciprocating motion

Fu, Wu‐Shung; Lian, Sin-Hong; Lai, Yin‐Hung

doi:10.1016/j.icheatmasstransfer.2009.06.006

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…In this respect, several previous studies have formulated a variety of HTE measures with the effects of reciprocation on heat transfer examined [4e11]. The noticeable heat transfer modifications from the static conditions were consistently reported for the reciprocating heat pipe [4], impinging jet, ribbed channels and swirl tube [5e8], P and k shaped channels [9,10] and curved duct [11]. For marine propulsive diesel engine, one of the widespread piston cooling configurations employs the shaker cooling scheme which is constituted by several blind bores that connect with a plenum chamber, Fig.…”

Section: Introductionmentioning

confidence: 91%

Comparative study of turbulent heat transfer in smooth and scale-rib roughened reciprocating blind ducts with laterally tangent entry jet

Chang

Chiou

Cai

2011

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 91%

Comparative study of turbulent heat transfer in smooth and scale-rib roughened reciprocating blind ducts with laterally tangent entry jet

Chang

Chiou

Cai

2011

International Journal of Thermal Sciences

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“…Their work laid a foundation for the heat transfer study of piston cooling inserts. In recent years, many researchers have designed various experimental devices to investigate the phenomenon of two-phase convective heat transfer, mostly using simplified models, such as Π and ⊔ shaped channels, 7,8 and curved duct. 9 Robinson 10 used thermal flow rigs for the study of heat transfer under simulated engine conditions, the experimental results show that coolant velocity, pressure, inlet temperature, surface roughness and coolant type all have an important influence on the heat transfer coefficient, while duct height and duct shape generally have a less pronounced effect, while equivalent local heat transfer coefficients may be achieved by impinging jets at much lower coolant flow rates relative to duct flow situations.…”

Section: Introductionmentioning

confidence: 99%

Experimental visualization of the gas-liquid two-phase flow inside the multi-cavity during reciprocating motion

Liang

Ming

et al. 2023

International Journal of Engine Research

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The piston cooling of engines are usually controlled by the “cocktail shake” mechanism inside the single cooling cavity, according to most studies of piston cooling published before. This paper researched on flow in multiple cooling cavities which are extensively used on pistons of low-speed engines, revealing that the flow in multi-cavity is quite different from that in a single cooling cavity. In this work, complete reciprocating cycles are captured to study the gas-liquid two-phase flow behavior of each cavity inside the multi-cavity piston, by conducting synchronous experiments using benchmarked high-speed camera and a real size piston. The effects of different engine speeds (40–64 rpm) and different inlet pressures (0.1–0.3 MPa) were investigated. Both the inner and annular cavities are cooled mainly by cocktail shaking, but two cooling mechanisms are observed in the outer cavity, the oscillatory effect and cyclonic effect, providing further development on piston cooling studies. The cyclonic effect enhances the heat transfer capacity of the sidewall surfaces. The coupling effect between multiple cavities produces a secondary mixing effect of the liquid and improves the overall turbulence. In this paper, a comprehensive analysis of the flow mechanism within a typical multi-cavity piston is presented.

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“…Their work laid a foundation for the heat transfer study of piston cooling insert. In recent years, many researchers have designed various experimental devices to investigate the phenomenon of two-phase convective heat transfer, mostly using simplified models, such as Π and ⊔ shaped channels [7], [8], curved duct [9]. Robinson [10] used thermal flow rigs for the study of heat transfer under simulated engine conditions, the experimental results show that coolant velocity, pressure, inlet temperature, surface roughness and coolant type all have an important influence on the heat transfer coefficient, while duct height, and duct shape generally have a less pronounced effect, while equivalent local heat transfer coefficients maybe achieved by impinging jets at much lower coolant flow rates relative to duct flow situations.…”

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

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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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An investigation of a mixed convection in a ⊔ shape channel moving with a reciprocating motion

Cited by 5 publications

References 2 publications

Comparative study of turbulent heat transfer in smooth and scale-rib roughened reciprocating blind ducts with laterally tangent entry jet

Comparative study of turbulent heat transfer in smooth and scale-rib roughened reciprocating blind ducts with laterally tangent entry jet

Experimental visualization of the gas-liquid two-phase flow inside the multi-cavity during reciprocating motion

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

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