Numerical solutions of 2-D unsteady incompressible flow with heat transfer in a driven square cavity using streamfunction-vorticity formulation

Ambethkar, V.; Kumar, Manoj

doi:10.18280/ijht.350303

Cited by 12 publications

(19 citation statements)

References 23 publications

(31 reference statements)

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“…xa0, xb0 -length of the dead zone in the air intake cavity and exhaust cavity, m; L-total journey of the cylinder, m; y-piston displacement, m The heat insulation and air discharge in the exhaust cavity of the cylinder is treated as the isentropic process and the temperature change inside the square-cavity is [19]:…”

Section: System Mathematic Modelmentioning

confidence: 99%

“…This method can be used to shift the transfer function from the complex domain to the frequency domain with clear physical significance to analyze the system performance. The frequency characteristic analysis is performed to equation (19) to study the Bode diagram of the system transfer function. It is found that the amplitude margin and phase margin of the system are both positive, suggesting that the system is stable.…”

Section: Gs S S Smentioning

confidence: 99%

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Research on the controllability and energy saving of the pneumatic direct drive system

Du¹,

Xiong²,

Xu³

et al. 2017

IJHT

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Aiming at the problem of large air consumption in traditional circuits, this paper proposes a new type of pneumatic circuit, which uses the high-pressure gas produced by the actuator to achieve energy conservation. First, the directly-driven pneumatic circuit of the small-sized air compressor is designed, and the corresponding closed circuit experimental table is set up. Second, the mathematical model of the system is established, the input and output of the air compressor are fitted with the least square method, and the transfer function of the system is derived. Third, the transfer function of the system is determined through parameter identification of the small air compressor system, and the time response and frequency response characteristics of the system are analyzed. Finally, the fuzzy PID controller is designed and the simulation and speed control experiment of the system under different working conditions are carried out. The research shows that compared with traditional circuit, the directly driven system of small air compressor can save 70%-74% of air consumption.

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Section: System Mathematic Modelmentioning

confidence: 99%

Section: Gs S S Smentioning

confidence: 99%

Research on the controllability and energy saving of the pneumatic direct drive system

Du¹,

Xiong²,

Xu³

et al. 2017

IJHT

View full text Add to dashboard Cite

show abstract

“…In light of these, PetroChina Tuha Oilfield Company invented the technology of supercritical cyclic steam stimulation (CSS) for exploiting heavy oil reservoirs [1,2]. Compared to conventional CSS, the supercritical CSS can extract the heavy oil deeper than 2,000m [3,4], realize a high daily yield of single well, and ensure a long period of stable production.…”

Section: Introductionmentioning

confidence: 99%

Supercritical cyclic steam stimulation of wellbore temperature and pressure distribution in Lukeqin oilfield

Zhang¹,

Liu²

2018

IJHT

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This paper aims to optimize the injection temperature and pressure of supercritical steam. For this purpose, the author acquired the variations of the supercritical steam parameters (i.e. density, viscosity, thermal conductivity, enthalpy and specific heat) with temperatures and pressures, plotted the 3D diagrams of the variation patterns, and performed surface fittings of the results. On this basis, the calculation formulas were put forward for the physical parameters of steam under changing temperature and pressure. According to the theories of heat transfer, thermodynamics and fluid mechanics, a mathematical model of wellbore temperature and pressure was created for supercritical cyclic steam simulation (CSS), and discretized the calculation formulas by node analysis. Based on the model, a computation software was compiled for supercritical CSS, and applied to calculate the variation in wellbore temperature and pressure with well depths. The results show that the calculated temperature of wellbore steam decreased linearly, while the calculated pressure of the steam increased linearly, with the increase of well depth. Through comparison, the calculated results were found to be consistent with the distribution curves of the test results. The error between the two sets of results is extremely small. The research findings shed new light on the design and optimization of supercritical CSS parameters.

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“…Messaoudi et al [21] analyzed numerical study of mixed convection and flow pattern in various across-shape concave enclosures. Ambethka and Kumar [22] numerecally studied the fluid flow and heat transfer in a four-sided lid-driven rectangular domain.…”

Section: Introductionmentioning

confidence: 99%

Mixed convection in complicated cavity with non-uniform heating on both sidewalls

Mekroussi¹,

Kherris²,

Mebarki³

et al. 2017

IJHT

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This paper deals with a numerical study of mixed convection flow and heat transfer inside lid-driven cavity. The main purpose in this present study is to maximize the heat transfer. For that, a new lid-driven cavity with two wavy walls and non-uniform heating on both sidewalls has been proposed. The two horizontal walls are considered isolated, while two variable sinusoidal temperature distributions are imposed to the left and right vertical side walls with different amplitudes and phases. A finite volume method is used to solve numerically the non-dimensional governing equations. The tests were carried out for Richardson numbers which vary from 0.01 to 100, amplitude ratios from 0 to 1, and phase deviations from 0 to , meanwhile the Prandtl number is fixed to Pr = 0.71. The distributions of streamlines, isotherms, and the variations of local and average Nusselt numbers with the variation of Richardson numbers, amplitude ratios and phase deviations are presented and compared with results given in the literature. The comparisons have showed a satisfactory agreement. Furthermore, the present study showed that the wavy walls with variable temperature have strong influence on enhancing heat transfer.

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Numerical solutions of 2-D unsteady incompressible flow with heat transfer in a driven square cavity using streamfunction-vorticity formulation

Cited by 12 publications

References 23 publications

Research on the controllability and energy saving of the pneumatic direct drive system

Research on the controllability and energy saving of the pneumatic direct drive system

Supercritical cyclic steam stimulation of wellbore temperature and pressure distribution in Lukeqin oilfield

Mixed convection in complicated cavity with non-uniform heating on both sidewalls

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