FORCED CONVECTIVE HEAT TRANSFER TO COOLED CYLINDERS AT LOW REYNOLDS NUMBERS AND WITH LARGE TEMPERATURE DIFFERENCES
Abstract
For the purpose of determining a general correlation for forced convective heat transfer coefficients for circular cylinders in cross-flow under conditions pertaining to cooled-film application for measurements in flames and hypersonic wakes, heat transfer measurements were obtained under simulated conditions created in a plasma-jet. Measurements were made by means of constant temperature, internally cooled, cylindrical film sensors in the Reynolds number range 5-75 for various temperature loadings, the maximum being T sub infinity/T sub s = 4, and for flows composed of He, N2 and CO2. The plasma-jet conditions were maintained such that at the points of measurements, i.e. at the potential core of the jet, ionization was negligible, recombination was complete and the turbulence intensity was low. All the fluid property values in the dimensionless parameters were evaluated at the arithmetic mean temperature. A kinematic viscosity ratio instead of the more usual temperature ratio was considered in the temperature loading factor to account for the different dependency of the transport properties on temperature for different gas species. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1968
- Accession Number
- AD0690330
Entities
People
- A. M. Ahmed