Drag Coefficients of Bubbles. 1st Report. Drag Coefficients of a Single Bubble in a Stagnant Liquid.

Modeling Satellite Drag Coefficients With Response Surfaces

Calculations of drag coefficients via hydrodynamic cellular automata

The drag coefficient, CD, of an arbitrary shaped object ca;; be calculated by twodimensional hydrodynamic cellular automata. Results spanning nearly four orders of magnitude in the Reynolds number (0.I < Re < 10~) are presented for a simple, hexagonal object, and good quantitative agreement with previous experiments on cylinders is obtained. Hydrodynamical cellular automata (IIDCA), also called...

Acoustic einstein-hopf drag on a bubble

Theoretical results show that the drag on a bubble can be modified by the presence of isotropic, homogeneous, broadband acoustic noise, when the band overlaps the bubble's resonance width. While these results constitute an acoustic analog to the Einstein-Hopf drag on an oscillating dipole in the presence of electromagnetic fluctuations, an important difference is that band-limited acoustic nois...

Thermosphere Density Variability , Drag Coefficients , and Precision Satellite Orbits

Precision orbit ephemerides (POE) are used to estimate atmospheric density along the orbits of CHAMP (Challenging Minisatellite Payload) and GRACE (Gravity Recovery and Climate Experiment). The densities are calibrated against accelerometer derived densities and considering ballistic coefficient estimation results. The 14-hour density solutions are stitched together using a linear weighted blen...

Drag reduction by compressible bubbles.

Drag reduction by bubbles in stationary turbulent flows is sensitive to the compressibility of the bubbles. Without this dynamical effect the bubbles only renormalize the fluid density and viscosity, an effect that by itself can only lead to a small percentage of drag reduction. We show in this paper that the dynamics of bubbles and their effect on the compressibility of the mixture can lead to...