Characteristics of frictional pressure drop of two-phase nitrogen flow in horizontal smooth mini channels in diabatic/adiabatic conditions

Chen, Xingya; Hou, Yu; Chen, Shuangtao; Liu, Xiufang; Zhong, Xin

doi:10.1016/j.applthermaleng.2019.114312

Cited by 8 publications

(3 citation statements)

References 50 publications

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“…Like the Blasius and the von Karman-Nikuradse relations, this correlation is commonly used for fluids at high saturation temperatures. However, later studies conducted by Zhang et al [35,36] and Zhong et al [37] verified that these equations predict pressure losses with single-phase cryogenic fluids with good accuracy. The advantage of using the Colebrook correlation lies in its accuracy, even for small-diameter ducts.…”

Section: Line Pressure Dropmentioning

confidence: 98%

Numerical Prediction of Internal Flows in He/LOx Seals for Liquid Rocket Engine Cryogenic Turbopumps

Maritano

Marin²,

Bertani

et al. 2022

Applied Sciences

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Cryogenic turbopumps are used in high-performance, lightweight liquid rocket engines for space applications. The development of bearings and shaft seals for cryogenic turbopumps requires detailed characterization of the internal flow, taking into account the effects of boiling and multi-component two-phase flow. Here, a flow network solver was developed to analyse the secondary flow circuit of a cryogenic turbopump where the propellant is mixed with high-temperature helium after bearing cooling. The network solver is based on an extension of a classic 1D homogeneous model, originally developed for a pure substance, to the case of two-phase multi-component flow. The solver is capable of predicting pressures, temperatures, flow rates, and species concentrations in a complex two-phase flow in the presence of non-condensable gases. The unsteady mass, momentum, and energy conservation equations are implemented in conjunction with the thermodynamic equations of state using a general-purpose finite volume formulation, where the pressure drop and the heat transfer are calculated using correlations. The numerical tool was validated by comparing its predictions with experimental data obtained during tests on the secondary circuit of an oxygen turbopump developed at Avio S.p.A. A number of engine operating conditions were considered (inlet helium temperature in the range of 250–280 K, helium/liquid oxygen drain in the range of 165–230 K). The predicted temperature values showed good agreement with the experimental data in most conditions.

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Section: Line Pressure Dropmentioning

confidence: 98%

Numerical Prediction of Internal Flows in He/LOx Seals for Liquid Rocket Engine Cryogenic Turbopumps

Maritano

Marin²,

Bertani

et al. 2022

Applied Sciences

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“…As a fracturing fluid, LN 2 has low saturation temperature and heat of vaporization. When it is injected into the wellbore, it can easily exchange heat with the pipe wall to form a two-phase flow. ,− As a result, stable injection and flow adjustment are difficult to achieve. Two-phase nitrogen flow in LN 2 fracturing is modeled as follows: where P 1 is the impact dynamic pressure of the gas–liquid two-phase jet before the shock wave and P 2 is the impact dynamic pressure of the gas–liquid two-phase jet after the shock wave.…”

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

Advances in Liquid Nitrogen Fracturing for Unconventional Oil and Gas Development: A Review

et al. 2022

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Liquid nitrogen (LN 2 ) fracturing is an anhydrous fracturing technology that enhances coal permeability and supports unconventional oil and gas exploitation. In this Review, we provide a systematic review of five aspects of LN 2 fracturing. They are the history of the technology's development, research topics, factors influencing fracturing efficiency, fracturing mechanism, and engineering processes and systems. Liquid nitrogen fracturing transforms coal and rock pore structure through mechanisms such as low temperature, freeze−thaw damage, and gas expansion. It changes coal and rock mechanical properties and improves the pore penetration and efficiency of unconventional oil and gas extraction. However, in-depth studies are still required in many areas. They include theoretical studies of twophase nitrogen flow in coal and rock, development of technical equipment to support field operations, and plans to monitor and evaluate fracturing efficiency. On the basis of the advances in LN 2 fracturing research and the challenges, we conclude that future research should focus on multiphase flow and field equipment and technology.

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“…Considerable research [14][15][16][17][18][21][22][23][24][25][26][27][28][29][30] has been conducted on the frictional PD at higher system pressure, i.e., above atmospheric pressure. The different types of fluids have been investigated…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Two-phase Pressure Drop in Adiabatic Tubes at Subatmospheric System Pressures

Kumar,

Kothadia

2023

Preprint

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The prediction of the frictional pressure drop in the two-phase flow has become highly crucial for the enhancement of heat transfer methodologies for various industrial applications in order to design thermal equipment efficiently. The pressure drop in the heat transfer equipment is affected by the system pressure, system geometry and working fluid. There is a dearth of literature on two-phase pressure drop in the conventional adiabatic tubes at subatmospheric system pressures. Experimental investigations on the pressure drop have been conducted at 0.25, 0.5, 0.75, and 1 bar system pressures in 1500 mm long, 8, 13.7, and 18 mm diameter adiabatic tubes. The steam at 0 – 1 vapor quality is used at 32 – 660 kg/m2s mass flux in the adiabatic tubes. The effects of tube diameter, vapor quality, mass flux and system pressure on two-phase frictional pressure drop are investigated. In the liquid-vapor flow, the pressure drop experiences a non-linear increase with changes in vapor quality. The frictional pressure drop in two-phase flow is elevated with higher vapor quality, reduced subatmospheric system pressure, increased mass flux, and a smaller tube diameter. The correlations suggested for two-phase frictional pressure drop at higher system pressure predict the pressure drop reasonably in the adiabatic tubes at subatmospheric system pressure.

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Characteristics of frictional pressure drop of two-phase nitrogen flow in horizontal smooth mini channels in diabatic/adiabatic conditions

Cited by 8 publications

References 50 publications

Numerical Prediction of Internal Flows in He/LOx Seals for Liquid Rocket Engine Cryogenic Turbopumps

Numerical Prediction of Internal Flows in He/LOx Seals for Liquid Rocket Engine Cryogenic Turbopumps

Advances in Liquid Nitrogen Fracturing for Unconventional Oil and Gas Development: A Review

Experimental Study of Two-phase Pressure Drop in Adiabatic Tubes at Subatmospheric System Pressures

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