The flow distribution in the parallel tubes of the cavity receiver under variable heat flux

Hao, Yun; Wang, Yueshe; Hu, Te

doi:10.1016/j.applthermaleng.2016.07.168

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…Matched MBLs yield almost identical classical size effects due to boundary scattering on pore edges, regardless of the pore shapes. 36,37 The computational domain is divided into many spatial bins called "subcells" to statistically determine the local electron states such as the carrier concentration. In simulations, the subcells are usually in rectangular shapes to fit the square-shaped pores and computational domain.…”

Section: Overview Of the Electron MC Simulationmentioning

confidence: 99%

Electron Monte Carlo simulations of nanoporous Si thin films—The influence of pore-edge charges

Hao

Xiao

2019

Journal of Applied Physics

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Electron transport within nanostructures can be important to varied engineering applications, such as thermoelectrics and nanoelectronics. In theoretical studies, electron Monte Carlo simulations are widely used as an alternative approach to solving the electron Boltzmann transport equation, where the energy-dependent electron scattering, exact structure shape, and detailed electric field distribution can be fully incorporated. In this work, such electron Monte Carlo simulations are employed to predict the electrical conductivity of periodic nanoporous Si films that have been widely studied for thermoelectric applications. The focus is on the influence of pore-edge charges on the electron transport. The results are further compared to our previous analytical modeling [Hao et al., J. Appl. Phys. 121, 094308 (2017)], where the pore-edge electric field has its own scattering rate to be added to the scattering rates of other mechanisms. * , * 2 ) 1/3 . For semi-classical electron MC simulations, the

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Section: Overview Of the Electron MC Simulationmentioning

confidence: 99%

Electron Monte Carlo simulations of nanoporous Si thin films—The influence of pore-edge charges

Hao

Xiao

2019

Journal of Applied Physics

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“…The cooling water of the cooler is from the tap water tank by use of an additional circulation system, which consisted of a cooling pump, a cooler, a cooling tower, and a cooling water tank. The experimental data obtained in Hao et al 21 are compared with numerical simulation results obtained under different total flow rate, pressure, and heat flux distribution. It can be observed in Figure 6 that most of the relative errors of flow fall between −15% and +15%, which represent the upper and lower bounds of the errors excepting for the results of Tube 1.…”

Section: Model Validationmentioning

confidence: 99%

“…The experimental data obtained in Hao et al 21 are compared with numerical simulation results obtained under different total flow rate, pressure, and heat flux distribution. It can be observed in Figure 6 that most of the relative errors of flow fall between −15% and +15%, which represent the upper and lower bounds of the errors excepting for the results of Tube 1.…”

Section: Model Validationmentioning

confidence: 99%

Optimization of thermo-hydraulic characteristics of solar cavity receiver under concentrated heat flux

Hao

Wang

2019

Science Progress

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It is important to study the effects of heat flux on the thermo-hydraulic characteristics in a solar cavity receiver because of the non-uniform radiation flux temporally and spatially. In this article, we presented a mathematical model of thermo-hydraulic characteristics of a solar cavity receiver, considering the effect of heat flux distribution on the energy transfer (radiation–conduction–convection). Using the model, the thermo-hydraulic characteristics under high concentrated heat flux were studied and then optimized the characteristics from two aspects: tube diameter (22, 27, 32, and 38 mm) and connection structure of the heating surface (H-type, central inlet/outlet, and vertical U-type). It was found that flow distribution changed smoothly at the diameter of 27 mm with the increase of the heat flux; when the diameter of tubes at the certain distance (1.6 σHF) from the spot center was replaced by 38 mm, the thermo-hydraulic characteristics were improved. For the evaporating surfaces, the thermo-hydraulic characteristics of working fluid (water) with the central inlet/outlet connection structure were better than those of the H-type connection structure. For the surperheated surfaces, the vertical U-type connection structure was applied to obtain the high temperature steam. These research findings are helpful for the safe and stable operation of the whole solar power system.

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“…The influence of key geometric parameters such as collector diameter and number of tubes on the flow field distribution was investigated, considering the influence of geometric parameters on the flow field distribution. Hao et al (2016) analyzed the effects of heat flow density ratio, total flow rate, and system pressure on the flow distribution in parallel tubes. The results showed that the flow distribution became significantly worse with the increase of heat flow density and concentration ratio; the flow distribution was improved with the decrease of system pressure.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of maldistribution characteristics of gas‐liquid two-phase flow in a horizontal pipeline

Wei

Fan

et al. 2022

Front. Earth Sci.

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In the flow distribution of oil and gas gathering and transportation system, the flow pattern, inertia force, gravity, and other factors will lead to uneven flow distribution of each outlet pipe, which will seriously affect the economy and safety of the gathering and transportation system. Therefore, it is of great significance to analyze the characteristics of gas–liquid two-phase flow in horizontal pipelines. For this reason, an experimental device for maldistribution control of gas–liquid two-phase flow is developed in this article. In order to solve the problem of flow maldistribution in gas–liquid two-phase flow pipe, the test experiments of maldistribution control under the conditions of three flow patterns (stratified flow, slug flow, and annular flow) are carried out. Through experiments, we revealed the control law of flow pattern to liquid maldistribution and gas maldistribution with or without flute pipes and formed the maldistribution control scheme of gas–liquid two-phase flow in the horizontal pipeline. It is found that it is more beneficial to the control of average liquid maldistribution degree under the condition of slug flow pattern in horizontal manifold without flute pipe, and it is more beneficial to the control of average gas maldistribution degree under the condition of annular flow pattern without flute pipe. Without the function of the flute pipe and in the annular flow pattern, it is beneficial to the control of average maldistribution degree of gas–liquid two-phase flow. The findings of this research can be used as a reference for the field maldistribution control of oil and gas gathering and transportation systems.

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The flow distribution in the parallel tubes of the cavity receiver under variable heat flux

Cited by 17 publications

References 19 publications

Electron Monte Carlo simulations of nanoporous Si thin films—The influence of pore-edge charges

Electron Monte Carlo simulations of nanoporous Si thin films—The influence of pore-edge charges

Optimization of thermo-hydraulic characteristics of solar cavity receiver under concentrated heat flux

Experimental investigation of maldistribution characteristics of gas‐liquid two-phase flow in a horizontal pipeline

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