A Mobile Medical Thermostatic Unit Based on the Ranque–Hilsch Vortex Effect

We examine small deviations from axial symmetry in a solid-propellant rocket motor, and describe a ‘bath-tub-vortex’ effect, in which substantial axial vorticity is generated in a neighbourhood of the chamber centreline. The unperturbed flow field is essentially inviscid at modest Reynolds numbers, even at the chamber walls, as has long been known, but the inviscid perturbed flow is singular at the centreline, and viscous terms are required to regularize it. We examine perturbations sufficiently small that a linear analysis is valid everywhere (εRe small, where ε is a measure of the perturbation amplitude and Re is a Reynolds number), and larger perturbations in which a nonlinear patch is created near the centreline of radius O(√ε). Our results provide an explanation of swirl experimentally observed by others, and a cautionary note for those concerned with numerical simulations of these flows, whether laminar or turbulent.

Download Full-text

Numerical simulation of tip leakage vortex effect on hydrogen-combustion flow around 3D turbine blade

Journal of Thermal Science ◽

10.1007/s11630-008-0186-7 ◽

2008 ◽

Vol 17 (2) ◽

pp. 186-192 ◽

Cited By ~ 1

Author(s):

Naoto Miyama ◽

Kazuaki Inaba ◽

Makoto Yamamoto

Keyword(s):

Numerical Simulation ◽

Turbine Blade ◽

Hydrogen Combustion ◽

Tip Leakage Vortex ◽

Tip Leakage ◽

Vortex Effect ◽

Combustion Flow

Download Full-text

The Cooling of Methane with Vortex Tubes

Journal of Mechanical Engineering Science ◽

10.1243/jmes_jour_1971_013_057_02 ◽

1971 ◽

Vol 13 (6) ◽

pp. 369-375 ◽

Cited By ~ 7

Author(s):

A. Williams

Keyword(s):

Carbon Dioxide ◽

Natural Gas ◽

Vortex Tube ◽

Expansion Ratio ◽

Methane Content ◽

Thomson Effect ◽

Vortex Effect ◽

Temperature And Pressure ◽

Vortex Tubes ◽

Gas Supply

Measurements have been made of the amounts of cold and heat produced by a vortex tube operated with methane containing some carbon dioxide, and with Algerian natural gas, which has a high methane content. The effects of gas supply temperature and pressure have been investigated. The contribution of the Joule–Thomson effect to the total cooling has been calculated and allowed for. Vortex effect cooling decreases with lowering of the supply temperature and probably disappears at the gas liquefaction point. It is dependent on the pressure expansion ratio across the tube. The findings are compared with those of other workers and those predicted by vortex tube theories.

Download Full-text

Professor A.P. Merkulov’ role in the process of research and development of the vortex effect

VESTNIK of the Samara State Aerospace University ◽

10.18287/2541-7533-2021-20-2-105-121 ◽

2021 ◽

Vol 20 (2) ◽

pp. 105-121

Author(s):

V. V. Biryuk ◽

S. V. Lukachev ◽

V. T. Volov ◽

Sh. A. Pirallishvili

Keyword(s):

Separation Process ◽

Energy Separation ◽

Vortex Interaction ◽

Practical Application ◽

Vortex Effect ◽

Separation Of Gases ◽

Leading Position ◽

Characteristic Features ◽

Vortex Tubes

The article is prepared for the centenary of the birth of Alexander Petrovich Merkulov. The stages of creating the theoretical basis of the vortex effect of energy separation of gases (the hypothesis of vortex interaction), and the creation and implementation of vortex devices based on the use of the vortex effect for aviation and medicine are considered. The role of Professor A.P. Merkulov in the study of characteristic features of the energy separation process in vortex tubes and practical application of the vortex effect in the USSR is shown. The works of ONIL-9 (KuAI-SGAU) headed by Alexander Petrovich Merkulov ensured the leading position of the Soviet school of thought in the field of vortex effect. These works contributed to the formation of modern understanding of the vortex effect and the successful beginning of industrial application of vortex apparatuses.

Download Full-text

Calculation of Vortex Effect in the Modified Numerical Scheme of Vortex-Element Method

Engineering Journal Science and Innovation ◽

10.18698/2308-6033-2012-4-169 ◽

2012 ◽

Author(s):

В.С. Морева ◽

Keyword(s):

Numerical Scheme ◽

Vortex Effect ◽

Vortex Element ◽

Element Method

Download Full-text

Vortex Effect, Vortex Power

Handbook of Research on Renewable Energy and Electric Resources for Sustainable Rural Development - Advances in Environmental Engineering and Green Technologies ◽

10.4018/978-1-5225-3867-7.ch021 ◽

2018 ◽

pp. 500-533

Author(s):

Serebryakov Rudolf ◽

Vladimir Vasilyevich Biryuk ◽

Vyacheslav Volov

Keyword(s):

Renewable Energy ◽

Pressure Gradient ◽

Thermal Energy ◽

Nonlinear Effects ◽

Continuous Media ◽

Swirling Flows ◽

Secondary Flows ◽

Vortex Effect ◽

Complex Phenomena ◽

Physical Phenomena

One of the non-traditional types of renewable energy is vortex energy, which arises when swirling flows of continuous media (e.g., liquid and gas) are formed and which can be converted into thermal energy, work, and also used to raise the temperature in some systems or to create a pressure gradient. Vortex structures are systematically found in many physical processes. In recent years, new aspects of studying the vortex have been considered. These aspects are associated with physical phenomena, which indicate the occurrence of nonlinear effects in liquid media. Vortex flows of continuous media are one of the most important and complex phenomena in the mechanics of liquids and gases. They are characterized by specific manifestations that are fundamentally different from the axial properties of the motion of the medium, such as the appearance of secondary flows.

Download Full-text