Accession Number : ADA306693

Title :   Convective Heat Transfer from a Cylinder in a Strong Acoustic Field.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Harder, Donald R.

PDF Url : ADA306693

Report Date : DEC 1995

Pagination or Media Count : 120

Abstract : Experimental work was performed to study the convective heat transfer characteristics from a cylinder in a strong zero-mean oscillatory flow represented by an acoustic field. Two different flow regimes are discussed; that in which laminar, attached flow around the cylinder is present, and that in which instabilities, such as vortex shedding occur. The experiment utilizes a steady state measurement method. A transition from the laminar to the unstable regime was observed to occur at a streaming Reynolds number of approximately 240. Within the laminar regime, the transition from 'intermediate' to 'large' values of the streaming Reynolds number occurs at approximately 130. Heat transfer results for large values of the streaming Reynolds number in the laminar regime closely match the present theory (less than 13% error). Correlations were developed to relate the heat transfer rate to the streaming Reynolds number in the unstable regime. This work would find application in the design of heat exchangers for a thermoacoustic engine.

Descriptors :   *CONVECTION(HEAT TRANSFER), *ACOUSTIC FIELDS, HEAT TRANSFER, THERMODYNAMICS, THESES, HEAT EXCHANGERS, VORTEX SHEDDING, TEMPERATURE GRADIENTS, THERMAL CONDUCTIVITY, ENGINES, ACOUSTIC VELOCITY, FLOW SEPARATION, LAMINAR FLOW, THERMOCOUPLES, REYNOLDS NUMBER, REFRIGERATION SYSTEMS.

Subject Categories : Acoustics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE