Experimental and numerical studies of choked flow through adiabatic and diabatic capillary tubes

Deodhar, Subodh D.; Kothadia, Hardik; Iyer, Kannan N.; Prabhu, S.V.

doi:10.1016/j.applthermaleng.2015.07.073

Cited by 30 publications

(6 citation statements)

References 25 publications

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“…Combining Eqs. ( 15), (16), and (19), yields a differential equation of momentum as follows：  to both sides of Eq. ( 20), introducing the formula of continuous Eq.…”

Section: ) Continuous Equationmentioning

confidence: 99%

“…The calculation of viscosity based on pμT equation is suitable for both gas and liquid components, with a good thermodynamic consistency. For example, Wang et al [5] proposed a unified viscosity and density calculation model for hydrocarbon fluid by modifying the Peng-Robinson (PR) EOS; Fan et al What's more, the two-phase flow of refrigerant in a capillary tube has been studied extensively [10][11][12][13][14][15][16]. The throttling process of the refrigerant in a capillary tube is commonly approximated to adiabatic isenthalpic expansion [15,16], which is very similar to that of the fire extinguishing agent filling up a pipeline.…”

mentioning

confidence: 99%

“…For example, Wang et al [5] proposed a unified viscosity and density calculation model for hydrocarbon fluid by modifying the Peng-Robinson (PR) EOS; Fan et al What's more, the two-phase flow of refrigerant in a capillary tube has been studied extensively [10][11][12][13][14][15][16]. The throttling process of the refrigerant in a capillary tube is commonly approximated to adiabatic isenthalpic expansion [15,16], which is very similar to that of the fire extinguishing agent filling up a pipeline. It must be noted that the homogeneous flow model was selected in most of the studies listed above, which have shown that the refrigerant and its mixture in a capillary tube could reach critical flow state predominantly at the end of a horizontal or spiral tube due to pressure loss [17].…”

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confidence: 99%

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Prediction of steady-state two-phase flow of nitrogen + extinguishant in the pipeline and a correlation for mass flow rate

Liu

Xie

Chen

et al. 2021

J Therm Anal Calorim

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Nitrogen used for pressurization of a fire extinguisher could be partially dissolved in the fire extinguishing agent, forming a binary mixture accompanied by a phase change while flowing inside the pipeline. Notwithstanding the widespread use of fire extinguishing system, an effective method has never been considered to predict two-phase flow performance of nitrogen + extinguishant in the pipeline. This paper presents investigation of the steady-state two-phase flow of extinguishant in the pipeline, including C3HF7 (HFC227ea), CF3I, and C2HF5 (HFC125). The average viscosity of mixture was calculated using six quoted methods (VM-1 to VM-6).Subsequently, inspired by one-dimensional adiabatic isenthalpic flow of refrigerant in a capillary tube, the corresponding prediction models (STFM-1 to STFM-6) for large mass flux nitrogen + extinguishant in a fire extinguishing pipeline were developed based on the VM-1 to VM-6. In comparison with previous experimental and theoretical data, the applicability and accuracy of the proposed mathematical models was examined from two different aspects, mass flow rate and pressure drop. The results indicated that both models, STFM-2 and STFM-3, predicted accurately for mass flow rate, and STFM-2 model predicted accurately for pressure drop. Finally, new correlations for mass flow rate and pressure drop have been established accurately based on summarizing the relevant predicted data, respectively. This work contributes to a good theoretical approach on the analysis of two-phase flow of nitrogen + extinguishant. Keywords: steady-state two-phase flow; adiabatic isenthalpic expansion; average viscosity; mass flow rate; pressure drop Nomenclature T' presumptive temperature r' parameter of the PRμ model defined in Eq. (5) p pressure, Pa μ dynamic viscosity, 10 -7 Pa•s

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“…Combining Eqs. ( 15), (16), and (19), yields a differential equation of momentum as follows：  to both sides of Eq. ( 20), introducing the formula of continuous Eq.…”

Section: ) Continuous Equationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Prediction of steady-state two-phase flow of nitrogen + extinguishant in the pipeline and a correlation for mass flow rate

Liu

Xie

Chen

et al. 2021

J Therm Anal Calorim

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“…For instance, in [1] two-phase flow of R134a in capillary tubes was investigated experimentally and numerically for a refrigeration application, while in [2] the capillary flow of CO 2 for a transcritical heat pump cycle was studied analytically, observing that for a given capillary tube an optimum cooling capacity exists. In [3] the rapid depressurization in the micro-flow of supercritical fluids for an advanced sodium reactor application was analysed, while in [4] the flow in the blow-off lines of a heavy duty gas turbine was modelled using the Fanno theory.…”

Section: Nomenclaturementioning

confidence: 99%

Compressible Fanno flows in micro-channels: An enhanced quasi-2D numerical model for turbulent flows

Cavazzuti

Karayiannis

2020

International Communications in Heat and Mass Transfer

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“…Two-phase refrigerant choked flow is often simulated using homogeneous flow, separated flow and drift flux models [17][18][19]. Some researchers investigated the flow characteristics in two-phase refrigerant choked flow [20][21][22]. The results indicated that tube diameter, tube length, inlet subcooling and condensing pressure or temperature would affect the pressure drop and the mass flow.…”

Section: Introductionmentioning

confidence: 99%

Multiphase mixture model to predict temperature drop in highly choked conditions in CO2 enhanced oil recovery

Teng

Zhang

et al. 2016

Applied Thermal Engineering

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CO 2 enhanced oil recovery (CO 2-EOR) technique is one potential option that can not only limit global warming, but also cut the high cost of Carbon dioxide Capture, Storage (CCS). It is well known that Joule-Thomson cooling (JTC) can occur when multiphase mixtures flow through wellhead chokes. To predict the temperature drop for multiphase mixtures with high CO 2 content through choke valves, a new multiphase choked flow model was developed, which was based on the isenthalpic model, gas-liquid solubility equilibrium model and gas-liquid thermal equilibrium model. At the same time, a verification experiment was carried out to study on the flow characteristics in multiphase choked flow. The results also showed that the model predictions were in good agreement with the experiment data and HYSYS simulation results. It was found that choke valve pressure drop, gas components and gas-liquid ratio had impacts on the JTC. The positive contributions to JTC for CH 4 , N 2 and H 2 were decreasing gradually and high mole fraction of CO 2 can enhance JTC. Based on this study, low GLR, low pressure drop and high upstream temperature can prevent

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Experimental and numerical studies of choked flow through adiabatic and diabatic capillary tubes

Cited by 30 publications

References 25 publications

Prediction of steady-state two-phase flow of nitrogen + extinguishant in the pipeline and a correlation for mass flow rate

Prediction of steady-state two-phase flow of nitrogen + extinguishant in the pipeline and a correlation for mass flow rate

Compressible Fanno flows in micro-channels: An enhanced quasi-2D numerical model for turbulent flows

Multiphase mixture model to predict temperature drop in highly choked conditions in CO2 enhanced oil recovery

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