The results of the experimental studies
of local heat process for
a gas–liquid system in the region of the cylindrical wall of
an agitated vessel equipped with the system of CD 6–RT impellers
are presented. A lower CD 6 impeller (Smith turbine) and upper RT
impeller (Rushton turbine) were located on the common shaft in a baffled
agitated vessel of inner diameter equal to 0.3 m. Liquid height in
the agitated vessel was equal to 0.6 m. Newtonian liquids of different
physical properties were used as a continuous phase. Air was dispersed
in the liquid. Local heat transfer coefficients were measured using
both thermal and electrochemical methods. In total, 2280 experimental
points were obtained. Distributions of the heat transfer coefficients
were described by means of eqs 12–17 and 18–23 as a
function of the Re and Pr numbers,
dimensionless axial coordinate z/H, and modified Fr
g number, separately, for turbulent and transitional
ranges of the fluid flow in the agitated vessel. Equations 12–17
and 18–23, concerning both coalescing and noncoalescing gas–liquid
systems, have no equivalent in the open literature.
The results of the experimental studies of the local heat transfer process for a gas-liquid system in the region of the cylindrical wall of baffled agitated vessel equipped with the system of A 315 (lower) -RT (upper) impellers are presented. Newtonian liquids of different physical properties and air were used as continuous and dispersed phases, respectively. Local heat transfer coefficients were measured using both thermal and electrochemical methods. Distributions of the heat transfer coefficients were described by means of equations (13) - (16) and (17) -(21), separately, for turbulent and transitional ranges of the fluid flow in the agitated vessel. These equations, concerning both coalescing and non-coalescing gas-liquid systems, have no equivalent in the open literature. Moreover, the results for the A 315 -RT impeller system were compared with our previous heat transfer data obtained using CD 6 -RT or RT -RT impeller systems.
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