Der Prallstrahlreaktor: Ein neuartiger Schlaufenreaktor mit einer sehr hohen Stoffaustauschleistung

On the Mass Transfer in an Impinging‐Stream Reactor

“…In the first part at a low power dissipation per unit volume up to about 0.7 kW/m 3 , the exponent of the curve amounts to about 0.6. This corresponds roughly with the experimental measurements obtained with other types of aerating reactors, for which the exponent varies according to literature data from 0.4 to 0.6 [1] . However, a large deviation in the value of the exponent between the impinging-stream reactor and other aerating systems occurs at a high power dissipation per unit reactor volume between 0.7 and 2 kW/m 3 , where ± depending on the gas flow rate ± exponent values between 0.7 and 1.2 were measured.…”

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In earlier publications, [1,2] the concept of the impingingstream reactor was described and its mass transfer performance was compared with other aerating apparatuses. The impinging-stream reactor distinguishes itself in comparison with other aerating systems not only through a high mass transfer coefficient but also through a high rate of increase of the mass transfer coefficient with increasing power dissipation.

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Gas Holdup in an Impinging-Stream Reactor

“…Examples of such flows are the flow through a steam turbine, where in the last stages condensation occurs or cavitating pumps. The occurrence of a second phase may drastically interact with the bulk flow and hence may affect the efficiency and safety of the turbine [1] or of the pump [6]. These interactions cannot be predicted by a single-phase simulation and thus the occurrence of the second phase has to be taken into account by suitable physical models together with a numerical approach, which is able to deal with two-phase flows.…”

“…Therefore, the primary aim of this comparison is to study how far the physical and numerical modeling of condensing flows can be used to develop a cavitation model. For that reason, this paper only presents numerical results obtained with the newly derived cavitation model; the interested reader may refer to [1,2] to obtain numerical results for condensing flows.…”

A Simple Method for Measuring the Gas Holdup in Two-Phase Flows

“…This method has been used to determine the local gas holdup in different locations inside an impinging-stream reactor aerated from the bottom. The concept of the impinging-stream reactor has been described in earlier publications [5,6]. The different forms of the two-phase flow inside the impinging-stream reactor (an upward two-phase stream near the nozzles, an impinging two-phase stream in the impinging zone and a downward two-phase stream inside the main reactor tube) gave a good test for the applicability of this method under turbulent and highly turbulent conditions.…”