Experimental study of the drag force acting on a heated particle

Dynamics of a spherical particle in mixed convection flow field

“…Using the same numerical scheme we have also simulated the free-convection force without imposing flow (namely at Re = 0) and compared it with experimental measurements in Fig. 7; the force is plotted vs. temperature, for different particle diameters (experimental results are taken from Katoshevski et al, 2000). The fit between the results is quite good and is a further validation of the numerical scheme.…”

“…The only drawback in this device is that there is no precise equivalent to the particle velocity in the Stokes expression which presents difficulties for the comparison with numerical simulations. There are several ways to estimate this value (D'Amore et al, 1994;Katoshevski et al, 2000) but in order to be as precise as possible the approach here is to numerically simulate the complex flow in the EDC using the same tools as for the problem of the uniform stream. In this way the velocity constraint in the entrance duct is obtained easily by dividing the experimental flow rate with the duct cross section area.…”

“…An adequate physical explanation for the behavior of the drag force in all range of mixed convection is thus fragmented, especially in the opposed-flow configuration where there are sharp flow transitions because of re-circulation. Only recently experimental studies have been performed on the mixed free-forced-convection phenomenon on small particles that enables the examination of the theoretical studies conducted so far (Bar-Ziv, Zhao, Zhang, & Kantorovich, 1998;Zhao, Kantorovich, Bar-Ziv, & Sarofim, 1998;Katoshevski, Zhao, Ziskind, & Bar-Ziv, 2000;Ziskind, Zhao, Katoshevski, & Bar-Ziv, 2001;Bar-Ziv, Zhao, Mograbi, Katoshevski, & Ziskind, 2002).…”

Hot Brownian Motion

“…Favorable conditions are assumed, such that potential complications resulting from long-time tails [8], convection [26], thermophoresis [27], etc., can be neglected. We do however distinguish the solvent temperature T s at the hydrodynamic boundary corresponding to the PRL 105, 090604 (2010) …”

Effects of Nonuniform Outflow and Buoyancy on Drag Coefficient Acting on a Spherical Particle

“…Lee and Balachandar estimated drag forces on a translating and rotating particle in a wall-bounded linear shear flow [12], and drag forces on a particle with a uniform outflow from the surface were studied by Kurose et al [13]. Furthermore, Katoshevski et al experimen-tally investigated the relation between particle temperature and drag forces; the results showed that the drag force acting on a heated particle increased due to free convection around the particle [14].…”