Publication

A capacitance prope to characterize gas bubbles in stirred tank reactors

Urs von Stockar, Paul Péringer
1993
Journal Articles

Abstract

An invasive plate and frame capacitance probe was designed for dielec. const. measurements over a wide frequency range (10-5000 kHz) in a 5-L stirred-tank reactor. Preliminary measurements with polyethylene beads showed a linear variation of the effective permittivity with the vol. fraction of the beads, in accordance with the Maxwell-Wagner theory. Results obtained by bubbling air under various agitation and aeration rates at 500 kHz in deionized water and the effect of a non-ionic antifoam on permittivity variations are shown and discussed; the technique is thought to allow precise local holdup measurements. Existing limitations and possible further improvements of the technique are discussed, esp. in view of the information that can be gained from the std. deviation of the measurements. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/0ae380c5-2b29-41a1-976d-5755f00febd7

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Urs von Stockar, Paul Péringer
1993
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0ae380c5-2b29-41a1-976d-5755f00febd7

About this result

Related concepts (32)

Continuous stirred-tank reactor

The continuous stirred-tank reactor (CSTR), also known as vat- or backmix reactor, mixed flow reactor (MFR), or a continuous-flow stirred-tank reactor (CFSTR), is a common model for a chemical reactor in chemical engineering and environmental engineering. A CSTR often refers to a model used to estimate the key unit operation variables when using a continuous agitated-tank reactor to reach a specified output. The mathematical model works for all fluids: liquids, gases, and slurries.

Chemical reactor

A chemical reactor is an enclosed volume in which a chemical reaction takes place. In chemical engineering, it is generally understood to be a process vessel used to carry out a chemical reaction, which is one of the classic unit operations in chemical process analysis. The design of a chemical reactor deals with multiple aspects of chemical engineering. Chemical engineers design reactors to maximize net present value for the given reaction.

Plug flow reactor model

The plug flow reactor model (PFR, sometimes called continuous tubular reactor, CTR, or piston flow reactors) is a model used to describe chemical reactions in continuous, flowing systems of cylindrical geometry. The PFR model is used to predict the behavior of chemical reactors of such design, so that key reactor variables, such as the dimensions of the reactor, can be estimated.

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A capacitance prope to characterize gas bubbles in stirred tank reactors

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