Effect of pipe geometry and material properties on flow characteristics and thermal performance of a conical Hartmann–Sprenger tube

Khoshkbijari, Babak Afzali; Karimi, Hossein

doi:10.1007/s40430-017-0843-4

Cited by 2 publications

(5 citation statements)

References 27 publications

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“…An obvious way to increase the temperature inside the resonator is to use thermal insulation [34,41] and to reduce the heat transfer surface area [70], as well to use materials with low thermal conductivity [65,71]. However, such methods are suitable only when the magnitude of cooling needed for the second "cold" energy separation flow does not matter.…”

Section: Recommendations For Reaching the Maximum Temperaturementioning

confidence: 99%

“…The hole at the bottom of the resonator can serve either to remove the hot part of the gas [34,65], to measure the temperature at the bottom of the resonator in the experiment [69,71] or to prevent clogging of the tube with condensate and mechanical impurities contained in the gas [92]. During the experiments performed by Kawahashi and Suzuki [34], the ratio of the hole area to the cross-sectional area of the resonator that was equal to 0.12 turned out to be the most effective.…”

Section: Practical Recommendationsmentioning

confidence: 99%

“…Resonators must simultaneously be strong, impenetrable, have high thermal conductivity and a wall structure that does not absorb pressure fluctuations [71]. For example, when using the Hartmann-Sprenger effect for ignition systems where not only high temperatures exist, but also corrosion with oxygen oxidation can occur, more resistant materials should be used; for example, an alloy of cobalt and chromium (CoCr powder) [57], zirconium or refractory PPFE polymers [54,65].…”

Section: Practical Recommendationsmentioning

confidence: 99%

“…where с = 360.32 m s ⁄ is the local speed of sound in dry air, taken from the averag perature inside the resonator [54]; 𝐾 = 4 is the shape factor equal to 4 for cylindric onators and conventionally equal to 2 for conical resonators [64,65]; 𝑙 = 0.0705 m length of the inner cavity of the medium resonator. The deviation of the frequency value obtained by numerical simulation from th oretical value was 6.8%.…”

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confidence: 99%

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Hartmann–Sprenger Energy Separation Effect for the Quasi-Isothermal Pressure Reduction of Natural Gas: Feasibility Analysis and Numerical Simulation

Belousov,

Lushpeev,

Sokolov

et al. 2024

Energies

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The present paper provides a brief overview of the existing methods for energy separation and an analysis of the possibility of the practical application of the Hartmann–Sprenger effect to provide quasi-isothermal pressure reduction of natural gas at the facilities within a gas transmission system. The recommendations of external authors are analyzed. A variant of a quasi-isothermal pressure regulator is proposed, which assumes the mixing of flows after energy separation. Using a numerical simulation of gas dynamics, it is demonstrated that the position of the resonators can be determined on the basis of calculations of the structure of the underexpanded jet without taking into account the resonator and, accordingly, without the need for time-consuming calculations of the dynamics of the processes. Based on the results of simulating the gas dynamics of two nozzle–resonator pairs installed in a single flow housing, it is shown that, in order to optimize the regulator length, the width of the passage between the two nearest resonators should be greater than or equal to the sum of diameters of the critical sections of the nozzles. Numerical vibroacoustic analysis demonstrated that the most dangerous part of the resonator is the frequency of its natural oscillations.

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Section: Recommendations For Reaching the Maximum Temperaturementioning

confidence: 99%

Section: Practical Recommendationsmentioning

confidence: 99%

Section: Practical Recommendationsmentioning

confidence: 99%

mentioning

confidence: 99%

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Hartmann–Sprenger Energy Separation Effect for the Quasi-Isothermal Pressure Reduction of Natural Gas: Feasibility Analysis and Numerical Simulation

Belousov,

Lushpeev,

Sokolov

et al. 2024

Energies

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show abstract

“…In the beginning, the thermal management was focused on heat sink solutions [1][2][3][4][5][6][7]. But as heat dissipation rate continued to increase, the focus shifted to two-phase heat pipe cooling techniques Technical Editor: Francis HR Franca, Ph.D. [8][9][10][11]. The thermal management challenges were not limited to electronic industries [12,13].…”

Section: Introductionmentioning

confidence: 99%

Influence of the channel profile on the thermal resistance of closed-loop flat-plate oscillating heat pipe

Mehta

Mehta²,

Patel

2020

J Braz. Soc. Mech. Sci. Eng.

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The closed-loop flat-plate oscillating heat pipe (CL-FPOHP) is a new two-phase heat transfer device for an effective thermal management in different systems. A number of theoretical and experimental investigations have been carried out on the CL-FPOHP in the past decades after its invention. However, due to the operational mechanism of the CL-FPOHP, the effects of channel profile on the thermal resistance have not been completely revealed so far. This paper aims at discussing the thermal resistance and thermal conductivity by changing the shape and size of the CL-FPOHPs channel. The thermal resistances of the CL-FPOHPs were investigated by varying the channel shape from square to circular, channel sizes from 2 × 2 mm 2 to 5 × 5 mm 2 , and heat load from 10 to 120 W. The pure copper was used to develop the CL-FPOHP and charged with the acetone with a charge ratio of 70%. The most suitable channel shape for the CL-FPOHP was found to be a square channel, and the most suitable channel size was observed to be 2 × 2 mm 2. The highest thermal conductivity of the CL-FPOHP reached to 2137 W/m °C. Keywords Flat-plate oscillating heat pipe • Two-phase heat transfer • Thermal resistance • Channel profile List of symbols Bo Bond number, g(l − v) r h 2 g Gravitational force (m/s 2) l Liquid density (kg/m 3) Subscripts CL-FPOHP Closed-loop flat-plate oscillating heat pipe FPOHP Flat-plate oscillating heat pipe TOHP Tubular oscillating heat pipe e Evaporator c Condenser l Liquid v Vapor W Watt L Distance of the two centers of the evaporator and condenser A Total cross-sectional area of CL-FPOHP

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Effect of pipe geometry and material properties on flow characteristics and thermal performance of a conical Hartmann–Sprenger tube

Cited by 2 publications

References 27 publications

Hartmann–Sprenger Energy Separation Effect for the Quasi-Isothermal Pressure Reduction of Natural Gas: Feasibility Analysis and Numerical Simulation

Hartmann–Sprenger Energy Separation Effect for the Quasi-Isothermal Pressure Reduction of Natural Gas: Feasibility Analysis and Numerical Simulation

Influence of the channel profile on the thermal resistance of closed-loop flat-plate oscillating heat pipe

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