Effect of low Reynolds number turbulence amplification on the Galileo probe flowfield

Details Effect of low Reynolds number turbulence amplification on the Galileo probe flowfield Effect of low Reynolds number turbulence amplification on the Galileo probe flowfield

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jspro..20..409g&link_type=abstract

Journal of Spacecraft and Rockets (ISSN 0022-4560), vol. 20, July-Aug. 1983, p. 409-411.

Physics

Ablation, Galileo Probe, Low Reynolds Number, Reentry Physics, Turbulence Effects, Eddy Viscosity, Jupiter Atmosphere, Mass Flow Rate, Surface Temperature

Scientific paper

The amplification of turbulence at low Reynolds numbers is analyzed as it affects the Jupiter-entry flowfield, surface-heating rate, and mass-loss rate of the 335-kg Galileo probe now being designed. The constant k(2) in the Clauser-Klebanoff outer law of the two-layer algebraic eddy-viscosity model of Cebeci (1970), as used in earlier models of the Galileo flowfield (Moss and Simmonds, 1982), is modified to increase at low Reynolds numbers, as found experimentally by Varner and Adams (1980). Calculations were performed for peak heating conditions (at 49.13 sec of entry), using a turbulent Prandtl number of 0.9 and turbulent Lewis numbers (LeT) of 0.8, 1.0, and 1.2. The low-Reynolds-number effect is found to produce mass-loss-ratio increases of from 4 to 50 percent, while an LeT of 1.2 produced an increase of from 4 to 10 percent as compared to an LeT of 1.0. While these findings are based on experimental data obtained under conditions somewhat different from those probably present on Jupiter, their importance for a conservative probe design is stressed.

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