Experimental Investigation of the Heat Transfer Process at a Gas-Dynamic Method of Energy Separation

Zditovets, A.G.; Vinogradov, Urii A.; Titov, A. A.

doi:10.1615/ihtc15.fcv.008965

Cited by 3 publications

(4 citation statements)

References 28 publications

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“…For the analysis we have chosen the optimum geometry of the tube with flow characteristics that are similar to those of a single Leontiev tube, studied experimentally in [5,6]. The tube length L was 450 mm, the distance to the first critical section (L 1 ) was 45 mm, and the distance to the second critical section (L 3 ) was 250 mm.…”

Section: Problem Statementmentioning

confidence: 99%

Numerical modeling of energy-separation in cascaded Leontiev tubes with a central body

Makarov

Makarova

2017

MATEC Web Conf.

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Section: Problem Statementmentioning

confidence: 99%

Numerical modeling of energy-separation in cascaded Leontiev tubes with a central body

Makarov

Makarova

2017

MATEC Web Conf.

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“…This effect is implemented in a supersonic tube of temperature stratification. Effectiveness of temperature division is not so great and depends on the surface area of heat exchange between gas streams, pressure and a speed of a working material at the entrance to the device, characteristics of a heat transfer agent and other factors [13,14]. A lot of scientific works try to solve the problem of increasing the effectiveness of a supersonic temperature stratification device [15][16][17][18][19][20][21].…”

Section: Technology Of Pressure Controlmentioning

confidence: 99%

The Technology of Isothermal Pressure Regulation of Natural Gas Based on Temperature Stratification

Tsynaeva

2015

Procedia Engineering

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The paper introduces a new technology of isothermal pressure regulation of natural gas based on temperature stratification which combines the vortex effect temperature stratification and supersonic gas-dynamic temperature stratification. The authors simulate physical and numerical controllers work. As a result of the experiments the most effective operating principles of the isothermal controller (based on the vortex tube temperature stratification) are introduced. The paper also presents calculations of the described pressure regulation controller while applying gas-dynamic temperature stratification. The authors conclude that the usage of the introduced technology of isothermal pressure regulation of natural gas will reduce expenses of gas transportation systems for their own needs (by 0,08-0,2 % of natural gas to their carrying capacity).

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“…The experimental investigations of heat transfer in the single Leontiev tube with a central cylindrical channel [16,17] show the energy separation in the airflow with Prandtl number equal to 0.71. The authors obtain the static pressure distribution on the nozzle wall, and temperature and Mach number distributions in the outer cross section of the tube for the subsonic and supersonic parts of the flow.…”

Section: Introductionmentioning

confidence: 99%

“…To decrease the recovery temperature and increase the energy separation effect, it was suggested to use the low-Prandtl gas mixtures (helium-xenon, hydrogenxenon etc.) [8][9][10], to blow some part of gas into the high-speed flow, to suck some part of gas from the low-speed flow [7,[11][12][13][14], or to use the wall with various surface reliefs [15].The experimental investigations of heat transfer in the single Leontiev tube with a central cylindrical channel [16,17] show the energy separation in the airflow with Prandtl number equal to 0.71. The authors obtain the static pressure distribution on the nozzle wall, and temperature and Mach number distributions in the outer cross section of the tube for the subsonic and supersonic parts of the flow.…”

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confidence: 99%

The numerical study of energy separation in a two-cascade Leontiev tube

Makarov

Makarova

Shibaev

2016

J. Phys.: Conf. Ser.

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Abstract. This paper presents results of numerical modeling of energy separation for heliumxenon gas mixture flow in a two-cascade Leontiev tube with central and outer (annular) supersonic nozzles. The Mach number and stagnation temperature distributions in longitudinal section and the heat-transfer intensity from the subsonic to supersonic flow have been obtained. The dependences of the cooling effect, the temperature efficiency factor and the adiabatic efficiency on a stagnation pressure in the receiver have been investigated. IntroductionIt is known that various physical effects lead to energy separation in the gas flow without heat transfer between the gas and external heat-sources (to temperature stratification). The most famous energyseparation effect is the Ranque-Hilsch effect in the vortex tube [1][2][3]. This effect has been used for building the aircraft air-conditioning system, cooling systems with a swirl gas flow, and small refrigerators [4,5].In the Leontiev tube, the heat flux appears due to the temperature differences between the subsonic and supersonic parts of the flow when the expanding supersonic part of the flow is cooled. The dissipation of kinetic energy of the stagnating supersonic flow near the wall increases its temperature but for the low-Prandtl gas mixture the recovery temperature on the wall is lower than the temperature of the subsonic part of the flow. As a result, the heat transfers across the heat-conducting separating wall from the supersonic part of the flow to the subsonic part even if the stagnation parameters for both parts of the flow are equal.The energy-separation method in a compressible flow was suggested and theoretically analyzed in [6,7]. There it was shown theoretically that the heat transfer across the heat-conducting separating wall depended on the recovery temperature on the wall from the side, flown by the supersonic part of gas under the adiabatic conditions. To decrease the recovery temperature and increase the energy separation effect, it was suggested to use the low-Prandtl gas mixtures (helium-xenon, hydrogenxenon etc.) [8][9][10], to blow some part of gas into the high-speed flow, to suck some part of gas from the low-speed flow [7,[11][12][13][14], or to use the wall with various surface reliefs [15].The experimental investigations of heat transfer in the single Leontiev tube with a central cylindrical channel [16,17] show the energy separation in the airflow with Prandtl number equal to 0.71. The authors obtain the static pressure distribution on the nozzle wall, and temperature and Mach number distributions in the outer cross section of the tube for the subsonic and supersonic parts of the flow. The results of numerical modeling of energy separation in the trans-and supersonic external flows are presented in monograph [18]. The study was performed for various gas mixtures with

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Experimental Investigation of the Heat Transfer Process at a Gas-Dynamic Method of Energy Separation

Cited by 3 publications

References 28 publications

Numerical modeling of energy-separation in cascaded Leontiev tubes with a central body

Numerical modeling of energy-separation in cascaded Leontiev tubes with a central body

The Technology of Isothermal Pressure Regulation of Natural Gas Based on Temperature Stratification

The numerical study of energy separation in a two-cascade Leontiev tube

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