The effect of the initial swirl of the supersonic flow of humid air on the adiabatic wall temperature

Abstract The paper presents the results of measuring the adiabatic wall temperature of an axisymmetric channel during acceleration of the moist air flow in it to supersonic speed. The initial swirl was imparted to the flow (swirling parameter S = 0.5, 1.0, 2.5). The relative initial humidity (RH) of the flow varied in the range of 10 ÷ 90%. When the flow was accelerated to supersonic speeds, part of the moisture condensed, which influenced the wall temperature. It is shown experimentally that with an increase in the initial moisture content of the flow to certain values, the distribution of the wall temperature for a flow without initial swirl (S = 0) and with swirl with S = 0.5, 1.0 practically coincide. However, from a certain value of RH, the wall temperature in the case of a swirling flow decreases in comparison with a flow without swirling. The maximum decrease in the wall temperature was achieved at RH = 90%. An increase in the initial swirl to S = 2.5 led to a greater decrease in the wall temperature, while the mass air flow through the channel decreased by 26% at an identical pressure drop.

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Conjugate-Mode Heat Transfer from a Module on the Floor of a Parallel-Plate Channel to Forced Convective Air Flow. Adiabatic Wall Temperature and Heat Transfer Coefficient Around the Module.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.61.1505 ◽

1995 ◽

Vol 61 (584) ◽

pp. 1505-1512 ◽

Cited By ~ 1

Author(s):

Wataru Nakayama ◽

Sang Hee Park

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Transfer Coefficient ◽

Wall Temperature ◽

Parallel Plate ◽

Air Flow ◽

Adiabatic Wall ◽

Plate Channel

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Free-Molecule Tube Flow and Adiabatic Wall Temperatures

Journal of Heat Transfer ◽

10.1115/1.3686021 ◽

1963 ◽

Vol 85 (2) ◽

pp. 111-118 ◽

Cited By ~ 14

Author(s):

E. M. Sparrow ◽

V. K. Jonsson ◽

T. S. Lundgren

Keyword(s):

Mass Flow ◽

Wall Temperature ◽

Energy Transport ◽

Circular Tube ◽

Tube Length ◽

Tube Flow ◽

Free Molecule ◽

Adiabatic Wall ◽

Flow Through ◽

Molecule Flow

The processes of mass and convective-energy transport in free-molecule flow are shown to bear useful similarities with the process of energy transport by thermal radiation. These similarities have been applied as a basis for deriving the mass and energy transfer characteristics for free-molecule flow in a circular tube. The net mass flow through tubes of various length-diameter ratios has been calculated as a function of the pressures and temperatures at the inlet and exit of the tube. A throughflow may occur even if the inlet and exit pressures are the same, provided that a temperature difference exists. For a length-diameter ratio in excess of 45, a fully developed mass flow relation applies. The distribution of the adiabatic wall temperature along the tube length has also been determined as a function of system pressures and temperatures and of the tube dimensions. Rather large variations of adiabatic wall temperature may occur for long tubes. The throughflow of energy shows characteristics similar to the throughflow of mass.

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