Two-Phase Flow in Refrigeration Systems

Gu, Junjie; Wang, Shujun; Gan, Zhongxue

doi:10.1007/978-1-4614-8323-6

Cited by 4 publications

(1 citation statement)

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“…The lubricant used for refrigerant R134a system is a synthetic lubricant generally referred to as polyalkylene glycol (PAG) oil. And the viscosity of PAG oil could be described as follows (Gu et al , 2014): where T is the operating temperature.…”

Section: Numerical Modelmentioning

confidence: 99%

Optimization of radial flexible mechanism in scroll compressor based on oil film lubrication analysis

Sun

Tang

Zhang³

et al. 2022

ILT

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Purpose The leakage problem caused by machining error, assembly error, wearing and thermal deformation has been the main factor hindering the development of scroll compressor. This paper aims to investigate the lubrication characteristics of radial clearance and further optimize the radial clearance, which can reduce the leakage in the tangential direction of the working chamber. Design/methodology/approach This paper establishes a model of radial clearance oil film lubrication in scroll compressor. And, the method to solve the Reynolds and energy equations is presented, as well as the dimensionless and discretization by finite element difference method. To verify the established model, performance experiment of scroll compressor for electric vehicle air conditioning system is also carried out. Findings Based on the presented model, the temperature field and distribution of the oil film in the radial clearance are analyzed. And the influence of the structural parameter on the radial clearance is further discussed. The optimum radial clearance could be achieved at β = 40°–42°, where the orbiting scroll is in the state of rotary balance. And, the simulation results coincide well with the experimental results. Originality/value This work provides an effective model to evaluate the lubrication characteristics of radial clearance in scroll compressor, which can provide guidance for the design of scroll compressor.

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Section: Numerical Modelmentioning

confidence: 99%

Optimization of radial flexible mechanism in scroll compressor based on oil film lubrication analysis

Sun

Tang

Zhang³

et al. 2022

ILT

View full text Add to dashboard Cite

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Two-phase slug flow control using baffle in a vessel-type slug catcher: a CFD simulation study

Rezvandehi,

Ansari,

Moayedi

2023

J Braz. Soc. Mech. Sci. Eng.

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TOWARD A NONINVASIVE MEASUREMENT METHOD OF CO₂ ARTERIAL PRESSURE

Cheniti

Besbes

Chafra

et al. 2021

J. Mech. Med. Biol.

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Until now, the measurement of carbon dioxide blood pressure is done ex vivo, using an invasive process. This paper describes a first step toward a novel noninvasive process for in vivo measurement of this pressure. As first approximation, the blood solution is modeled as a simple aqueous solution of carbon dioxide in a cylindrical rigid canalization. The drift flux model and the Young–Laplace equation are employed to describe the fluid behavior. The numerical model relates the carbon dioxide pressure through the mixture pressure and velocity. The spatial distributions of these parameters are implemented to create linear mathematical relations between the mean mixture pressure and the radial velocity variation. As long as we are interested in a noninvasive measuring of the carbon dioxide pressure, a response model is proposed to describe the ultrasound signal backscattered by the considered solution. The linear relations are applied to deduce the carbon dioxide pressure through the measured radial velocity difference, using two computing methods of ultrasound signal. A comparative study is made between them showing the more appropriate process to compute the carbon dioxide pressure.

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Two-Phase Flow in Refrigeration Systems

Cited by 4 publications

References 0 publications

Optimization of radial flexible mechanism in scroll compressor based on oil film lubrication analysis

Optimization of radial flexible mechanism in scroll compressor based on oil film lubrication analysis

Two-phase slug flow control using baffle in a vessel-type slug catcher: a CFD simulation study

TOWARD A NONINVASIVE MEASUREMENT METHOD OF CO₂ ARTERIAL PRESSURE

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Two-Phase Flow in Refrigeration Systems

Cited by 4 publications

References 0 publications

Optimization of radial flexible mechanism in scroll compressor based on oil film lubrication analysis

Optimization of radial flexible mechanism in scroll compressor based on oil film lubrication analysis

Two-phase slug flow control using baffle in a vessel-type slug catcher: a CFD simulation study

TOWARD A NONINVASIVE MEASUREMENT METHOD OF CO2 ARTERIAL PRESSURE

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TOWARD A NONINVASIVE MEASUREMENT METHOD OF CO₂ ARTERIAL PRESSURE