Unsteady Thermally Driven Flows on Gentle Slopes

Seasonal flows on warm Martian slopes.

Water probably flowed across ancient Mars, but whether it ever exists as a liquid on the surface today remains debatable. Recurring slope lineae (RSL) are narrow (0.5 to 5 meters), relatively dark markings on steep (25° to 40°) slopes; repeat images from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment show them to appear and incrementally grow during warm seasons and ...

The Equations of Motion for Thermally Driven, Buoyant Flows

In this paper a set of approximate equations is derived which is applicable to very nonadiabati c, nondissipative, buoyant flows of a perfect gas. The flows are assumed to be generated by a heat source in which the heat is added slowly. The study is motivated by the occurrence of such f] ows in fires. There, the time scale associated with the fire growth and resultant f]uid moti on is usually l...

Experimental Methods for Quantitative Analysis of Thermally Driven Flows

Properly designed validation experiments are necessary to establish a satisfactory level of confidence in simulation algorithms. In this review recent achievements in the measurement techniques used for monitoring macroscopic flow field features are presented. In particular, optical and electro-optical methods, for example thermography, tomography or particle image velocimetry, are reviewed and...

Unsteady Flows in Turbines

Ice-driven creep on Martian debris slopes

[1] Accumulations of rocky debris at the base of bedrock escarpments on Mars have mean inclinations of 20 , well below the angle of repose ( 35 ). These inclinations decrease with increasing latitude, suggesting a climatic influence. We present evidence that these low inclinations are the result of gravitational creep driven by repeated deposition and sublimation of ground ice. We estimate the ...