Modeling study on two-phase adiabatic expansion in a reciprocating expander

Hiroshi Kanno, Naoki Shikazono

研究成果: Article

3 引用 (Scopus)

抄録

In the present study, modeling of two-phase adiabatic expansion in a reciprocating cylinder is proposed. Experimental data obtained from the setup with piston and cylinder which mimics reciprocating expander were used for model validation. From the experiment, it is recognized that mixing of the liquid due to boiling bubbles has a strong impact on pressure change during adiabatic expansion. Therefore, two phase adiabatic vaporization in a cylinder is considered to be mainly dominated by the heat transfer between the bulk liquid and the gas–liquid interface. Experimental correlation for the Nusselt number based on Prandtl, Reynolds and Bond numbers is proposed. Pressure change and indicated adiabatic efficiency in adiabatic two phase expansion are calculated by solving the energy balance equations using the proposed Nusselt number correlation. The present model can reproduce the pressure-change and the indicated adiabatic efficiency in adiabatic two phase expansion within about 5% accuracy.

元の言語English
ページ(範囲)142-148
ページ数7
ジャーナルInternational Journal of Heat and Mass Transfer
104
DOI
出版物ステータスPublished - 2017 1 1
外部発表Yes

Fingerprint

expansion
Nusselt number
Bond number
Liquids
Prandtl number
liquids
Energy balance
pistons
Bubbles (in fluids)
Vaporization
Pistons
boiling
Boiling liquids
Reynolds number
bubbles
heat transfer
Heat transfer
Experiments
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

これを引用

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abstract = "In the present study, modeling of two-phase adiabatic expansion in a reciprocating cylinder is proposed. Experimental data obtained from the setup with piston and cylinder which mimics reciprocating expander were used for model validation. From the experiment, it is recognized that mixing of the liquid due to boiling bubbles has a strong impact on pressure change during adiabatic expansion. Therefore, two phase adiabatic vaporization in a cylinder is considered to be mainly dominated by the heat transfer between the bulk liquid and the gas–liquid interface. Experimental correlation for the Nusselt number based on Prandtl, Reynolds and Bond numbers is proposed. Pressure change and indicated adiabatic efficiency in adiabatic two phase expansion are calculated by solving the energy balance equations using the proposed Nusselt number correlation. The present model can reproduce the pressure-change and the indicated adiabatic efficiency in adiabatic two phase expansion within about 5{\%} accuracy.",
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AU - Kanno, Hiroshi

AU - Shikazono, Naoki

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AB - In the present study, modeling of two-phase adiabatic expansion in a reciprocating cylinder is proposed. Experimental data obtained from the setup with piston and cylinder which mimics reciprocating expander were used for model validation. From the experiment, it is recognized that mixing of the liquid due to boiling bubbles has a strong impact on pressure change during adiabatic expansion. Therefore, two phase adiabatic vaporization in a cylinder is considered to be mainly dominated by the heat transfer between the bulk liquid and the gas–liquid interface. Experimental correlation for the Nusselt number based on Prandtl, Reynolds and Bond numbers is proposed. Pressure change and indicated adiabatic efficiency in adiabatic two phase expansion are calculated by solving the energy balance equations using the proposed Nusselt number correlation. The present model can reproduce the pressure-change and the indicated adiabatic efficiency in adiabatic two phase expansion within about 5% accuracy.

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KW - Indicated adiabatic efficiency

KW - Two-phase flow

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