A gas jet impacting a cavity

A subsonic air jet impinging upon a cavity is studied to explain the resultant heating phenomenon. Flow visualization within the cavity shows a large central vortex dominating the flow pattern. Velocity measurements inside the cavity are made using a hot-wire anemometer. Temperature is measured with a copper-constantan thermocouple. The velocity field within the cavity is described by a modified Rankine combined vortex. An uncommon form of the energy equation is used to account for turbulent heating in adverse pressure gradients. A theoretical solution is developed to model the temperature field in the cavity. There is a good agreement between the calculated and measured temperatures. The heating effect is related to Ranque-Hilsch tubes.

[1]  Temperature. , 2018, Nursing times.

[2]  Karl Stephan,et al.  An investigation of energy separation in a vortex tube , 1983 .

[3]  M. Kurosaka.  Acoustic streaming in swirling flow and the Ranque—Hilsch (vortex-tube) effect , 1982, Journal of Fluid Mechanics.

[4]  K. Stewartson.  Mechanics of fluids , 1978, Nature.

[5]  L. S. Fletcher,et al.  Aerothermodynamic Characteristics of a Resonance Tube Driven by a Subsonic Jet , 1977 .

[6]  A. J. Pavli,et al.  RESONANCE TUBE IGNITION OF HYDROGEN-OXYGEN MIXTURES , 1971 .

[7]  C. U. Linderstrøm-Lang.  The three-dimensional distributions of tangential velocity and total- temperature in vortex tubes , 1971 .

[8]  C. U. Linderstrm-Lang.  The three-dimensional distributions of tangential velocity and total-temperature in vortex tubes , 1971, Journal of Fluid Mechanics.

[9]  P. A. Thompson,et al.  Jet-Driven Resonance Tube , 1964 .

[10]  M. Sibulkin.  Experimental investigation of energy dissipation in a resonance tube , 1963 .

[11]  M. Sibulkin,et al.  Unsteady, viscous, circular flow Part 3. Application to the Ranque-Hilsch vortex tube , 1962, Journal of Fluid Mechanics.

[12]  M. Perlmutter,et al.  Analysis of the flow and energy separation in a turbulent vortex , 1960 .

[13]  E. Brun,et al.  Research on the Acoustic Air‐Jet Generator: A New Development , 1957 .

[14]  Rudolph Kassner,et al.  Friction Laws and Energy Transfer in Circular Flow. Part 1 - The Law of Shear Stresses in Circular Flow. Part 2 - Energy Transfer in Circular Flow and Possible Applications (Explanation of the Hilsch or Ranque Effect) , 1948 .

[15]  R HILSCH,et al.  The use of the expansion of gases in a centrifugal field as cooling process. , 1947, The Review of scientific instruments.

[16]  Jul. Hartmann,et al.  LXXVII.On the production of acoustic waves by means of an air-jet of a velocity exceeding that of sound , 1931 .

[17]  L. Fletcher,et al.  Aerothermodynamics of a Simple Resonance Tube , 1977 .