The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform
Laichao Wang - One of the best experts on this subject based on the ideXlab platform.
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Pressure Drop Calculation Models of Wellbore Fluid in Perforated Completion Horizontal Wells
International Journal of Heat and Technology, 2016Co-Authors: Xiaodong Peng, Laichao WangAbstract:Perforated completion is a main method of horizontal well completion. Based on the mass conservation equation, the momentum conservation equation and the variable mass flow in the horizontal wellbore, Pressure Drop calculation models of the wellbore fluid are established in perforated completion of horizontal wells. The results of calculation and analysis show that the frictional Pressure Drop, Acceleration Pressure Drop and mixing Pressure Drop have different effects on total Pressure Drop of the wellbore fluid, and the frictional Pressure Drop plays a major role while the Acceleration Pressure Drop and mixing Pressure Drop have little influence. The liquid viscosity, production and horizontal wellbore length also have different effects on various kinds of Pressure Drop. When liquid viscosity is smaller and the length of the horizontal wellbore is shorter, the effects of the Acceleration Pressure Drop and mixing Pressure Drop cannot be neglected. The theoretical basis and the calculation model of the variable mass flow Pressure Drop of horizontal wellbore are provided.
Xiaodong Peng - One of the best experts on this subject based on the ideXlab platform.
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Pressure Drop Calculation Models of Wellbore Fluid in Perforated Completion Horizontal Wells
International Journal of Heat and Technology, 2016Co-Authors: Xiaodong Peng, Laichao WangAbstract:Perforated completion is a main method of horizontal well completion. Based on the mass conservation equation, the momentum conservation equation and the variable mass flow in the horizontal wellbore, Pressure Drop calculation models of the wellbore fluid are established in perforated completion of horizontal wells. The results of calculation and analysis show that the frictional Pressure Drop, Acceleration Pressure Drop and mixing Pressure Drop have different effects on total Pressure Drop of the wellbore fluid, and the frictional Pressure Drop plays a major role while the Acceleration Pressure Drop and mixing Pressure Drop have little influence. The liquid viscosity, production and horizontal wellbore length also have different effects on various kinds of Pressure Drop. When liquid viscosity is smaller and the length of the horizontal wellbore is shorter, the effects of the Acceleration Pressure Drop and mixing Pressure Drop cannot be neglected. The theoretical basis and the calculation model of the variable mass flow Pressure Drop of horizontal wellbore are provided.
Z Y Guo - One of the best experts on this subject based on the ideXlab platform.
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thermal mechanism in gas liquid two phase flow systems under heating an application of thermal drag concept
International Communications in Heat and Mass Transfer, 1992Co-Authors: Z Y GuoAbstract:This paper reports that the concepts of thermal drag and thermal clogging, etc. developed for single-phase thermal compressible flow were extended into gas-liquid two phase flow systems under heating, and used to investigate heating effect on fluid flow within such systems. An approximate analytical relation between thermal Acceleration Pressure Drop and dimensionless heating number He was obtained based on these concepts and the compressibility Z of fluid was employed to conduct generalized analyses. Good agreements are reached by comparing its results with some existing data.
Mingdao Xin - One of the best experts on this subject based on the ideXlab platform.
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FLOW BOILING HEAT TRANSFER AND TWO-PHASE Pressure Drop OF R134A IN A MICROFINNED HELICALLY COILED TUBE
International Journal of Modern Physics B, 2005Co-Authors: Wenzhi Cui, Qiufan Chen, Mingdao XinAbstract:The performance of evaporator is of importance in cryogenic and refrigeration systems. In this paper, evaporative heat transfer and Pressure Drop characteristics of refrigerant R134a boiling inside a new geometry microfinned helically coiled tube is experimentally studied. Compared with corresponding smooth helically coiled tube, the heat transfer enhancement factors of microfinned helically coiled tube are up to 2.2 with the varieties of mass flux and heat flux. The frictional Pressure Drop values are obtained by subtracting Acceleration Pressure Drop and gravitational Pressure Drop from the measured total Pressure Drop. The frictional Pressure Drop data can be well correlated using Lockhart–Martinelli method.
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Convective Boiling Heat Transfer and Pressure Drop Characteristics of R134a in a Microfinned Helically Coiled Tube
Heat Transfer: Volume 2, 2005Co-Authors: Wenzhi Cui, Quan Liao, Mingdao Xin, Qinghua Chen, Tien-chien JenAbstract:The main purpose of this paper was to experimentally study the heat transfer and Pressure Drop characteristics of refrigerant R134a boiling inside a new geometry microfin helically coiled tube. Experiments were performed in a range of mass quality from 0.05 up to 0.9, mass velocity 70 ∼ 380 kg/m2s and heat flux 2.0 ∼ 21.8 kW/m2. The local and average convective boiling heat transfer coefficients were reported in this paper, which were found to be dependent on both of mass flux and heat flux. Compared with corresponding smooth helically coiled tube, the microfin helically coiled tube could enhance the convective boiling heat transfer very well. The enhancement factor was up to 2.2 with the variety of mass flux and heat flux. Heat transfer in annular flow was specially studied. A flow boiling heat transfer correlation was presented for the annular flow regime, which had a mean deviation of 9.1%. The frictional Pressure Drop values were obtained by subtracting Acceleration Pressure Drop and gravitational Pressure Drop from the measured total Pressure Drop. The frictional Pressure Drop data can be well correlated by Lockhart-Martinelli parameter. Considering the corresponding flow regimes, i.e., stratified and annular flow, two frictional Pressure Drop correlations were proposed, and showed a good agreement with the respective experimental data.
Haim Kalman - One of the best experts on this subject based on the ideXlab platform.
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Acceleration Pressure Drop analysis in horizontal dilute phase pneumatic conveying system
Powder Technology, 2018Co-Authors: Naveen Mani Tripathi, A Levy, Haim KalmanAbstract:Abstract In pneumatic conveying pipelines, there are specific periods and distances where particles start to accelerate or deaccelerate from specific velocity to steady state. This phenomenon attributes an additional loss of energy also invoke as Acceleration Pressure Drop. The total Acceleration Pressure Drop is defined by measuring the Pressure difference between two points at the Acceleration zone. The Pressure Drop of steady state flow for the same length is then reduced from the previous measurement to find Acceleration only energy loss. Theoretical equation of momentum change, a material physics, has used to explain the Acceleration Pressure Drop in horizontal pipe. Experimental results have compared with the values of theoretical equation. Results indicated that predicted Pressure Drop is deviating from the experimental results. Hence, the problem was realized that there was need to precisely predict steady state (collision and friction) Pressure Drop in this zone, which in classical way of prediction would be used to do just by extrapolation up to the Acceleration zone. Hence, a novel factor α has derived by the authors to accurately predict steady state loss in this zone. Experiments have conducted by using different kinds of materials (Bottom ash, Glass beads, Semolina etc.) at different conveying conditions. To view point of design engineers, contribution of Acceleration Pressure Drop in total pipeline has demonstrated by comparing 10 m and 100 m long horizontal pipe. To a simplest case of conveying criteria, Acceleration loss contribute 25% of total pipeline Pressure Drop for 10 m pipe and it reduced to 4% for 100 m pipeline. It has concluded that Acceleration Pressure Drop, between any two velocities, would be predicted with momentum change equation and there is need to accurately predict the steady state Pressure Drop by factor alpha (α) to predict total Pressure Drop in Acceleration zone.
