particle drift delay factor β formation damage coefficient γ ionic strength ε erosion ratio (ratio between the detaching and attaching torques); static dielectric constant (for clay, quartz, and NaCl solution) ε0 dielectric permittivity of vacuum, I2 T4 M−1 L−3 ζ zeta potential, M ...
The meaning of DRAG COEFFICIENT is a factor representing the drag acting on a body (such as an automobile or airfoil).
The relationship between friction factor and Reynolds number. (a) The relationship between the friction coefficient and Reynolds number of sodium alginate solutions with various concentrations. (b) depict three sets of experimental data, serving to validate the reproducibility of the results (red line:...
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On the aerodynamic performance side, as pointed out by Green [6], the maximum lift-to-drag ratio (L/D)max depends on the ratio of the aircraft span to the square root of the product of the induced drag factor and the zero-lift drag area, which is proportional to the wetted area of...
For the lift-drag coefficient, the fluid is run in high speed. The characteristics of optimum foil cover: 1) at the specified speed, the foil have the maximum lift force and is able to withstand the drag; 2) the foil have minimum form factor; and 3) the stall phenomenon does not ...
Generating a high total aerodynamic force coefficient comes at the cost of a lower power factor (PF), a measure of how much lift is generated with a unit of power34. Lentink and Dickinson34showed that model fly wings flapping at a Reynolds number of 14,000, close to parrotlets, attain a...
However, as a damping factor, particle viscosity can be important for the onset of shape instability and shape oscillations. Based on our experimental results, along with previous experimental, analytical and numerical works of various authors, a systematic description of the particle drag is ...
Equation 2 has been used to estimate the values and Eq. 8 to obtain the experimental values. The shape of the particles is given using the Corey shape factor (Sf). Full size imageIn Fig. 2 the drawback of using silica sands drag coefficient equation to estimate the drag coefficients of ...
two-phase flow/ generalized friction factordrag coefficient correlationsfluid-particle interactions/ A4755K Multiphase flowsThe author points out that the paper by Gibilaro et al. (ibid. vol.40, p.1817-1823, 1985) yields results which are almost identical to those he published in the book `...