Drag coefficient and velocity of rise of a single collasping two‐phase bubble

A new model for the drag coefficient of a swarm of condensing vapour–liquid bubbles in a third immiscible liquid phase

“…Their results for a very low Reynolds number (Re o 0:1 Þ surprisingly fell under the drag coefficient results of an inviscid fluid sphere (bubble), which does not agree with other experimental results, for example (Higeta et al, 1979). Wanchoo et al (1997) justified these results by citing the mobility of the condensate film surrounding the bubble surface and the strong internal circulation. This was rejected by Kalman and Mori (2002).…”

“…They concluded that the two-phase bubble behaves as an inviscid fluid sphere at early stage of condensation (relatively high Re number), while it is approximated by a rigid sphere at the last stage of condensation (low Re number). The second study was carried out experimentally by Wanchoo et al (1997). Three different dispersed phases, n -pentane, isopentane and furan were condensed in distilled water and in aqueous glycerol solutions of 75% wt and 98.3%.…”

Process enhancement in aqueous ammonia PCC using a direct contact condenser

“…The key advantages of a DCHX are in simpler design, lower cost, a high heat‐transfer rate, an absence of corrosion and fouling problems, and the potential to work with a very low temperature driving force . They can be found in several applications such as water desalination, geothermal power generation, solar energy, and the hydrogen generation industries where mixing between hot and cold fluids is permissible . If one fluid changes its phase to liquid / vapor as a result of intimate contact with the other fluid, the DCHX would act as a condenser / evaporator, accordingly.…”

Experimental measurements and theoretical prediction for the volumetric heat transfer coefficient of a three-phase direct contact condenser

“…Much attention has been paid to the onecomponent direct contact condenser in the literature. On the other hand, studies of two-component direct contact condensers mainly concentrate on understanding the direct condensation phenomena through investigation of the heat transfer and the hydrodynamics of a single bubble [2][3][4][5][6][7][8][9][10][11][12][13] and a train of bubbles [14,15] The resulting lack of understanding has severely limited the practical implementation of such condensers.…”