Mass transfer between liquid drops and a surrounding fluid with an accompanying instantaneous chemical reaction is important in a number of industrial processes. For small drops which behave as rigid particles the coupled transport-reaction phenomenon occurs through a moving boundary mechanism. Here we present a theoretical analysis of the problem under non-isothermal conditions by considering the continuous phase diffusional resistance. The relevant transport equations are subjected to a coordinate transformation in order to immobilize the reaction front. Computed results for the enhancement factor and interfacial temperature rise are presented for a wide range of relevant system parameters. The results show enhancement factor and interfacial temperature rise maxima and some other interesting features that can be explained on a physical basis. © 1993.

U MIDDYA

P RAY

B K DUTTA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Non-isothermal enhancement factor for mass transfer with instantaneous reaction in a rigid drop

The Chemical Engineering Journal

A theoretical analysis is presented for the absorption of a gas accompanied by instantaneous chemical reaction with a dissolved reagent in a falling liquid film of liquid. The reaction occurs on a moving front inside the liquid film separating the zones containing either of the reactants. The governing equations are solved by using a coordinate transformation to immobilize the reaction front. The effects of the different system parameters on the reaction front profile, absorption rate and enhancement factor are presented for both cocurrent and countercurrent flow of the gas. In the former case the reaction front profile shows a maximum, but in the later case it is monotonic in the axial distance along the film. The enhancement factor plots exhibit maxima in both the cases. © 1990, Gordon and Breach Science Publishers S.A.

Chemical Engineering Communications

Gas absorption with instantaneous chemical reaction in a falling film for parallel and countercurrent flows

In an earlier paper, Dutta et al. (1988) reported a theoretical analysis of mass transfer accompanied by an irreversible instantaneous chemical reaction in a rigid drop. The phenomenon, which is common to a number of industrial gas-liquid and liquid-liquid contacting operations, proceeds through a moving boundary mechanism. The reaction between a chemical species present in the drop and a second reactant species diffusing into the drop from a surrounding continuous phase occurs at a reaction front that progressively recedes away from the surface of the drop toward its center. While in their analysis Dutta et al. neglected the mass-transfer resistance in the continuous phase, its effects are shown here to be quite significant in many situations of practical importance, particularly during the initial stage of contact between phases.

AIChE Journal

Diffusion with instantaneous reaction in a drop with continuousâ€phase resistance

Mass transfer with instantaneous chemical reaction in a rigid drop

Gas absorption in a laminar falling film with instantaneous chemical reaction with a reactant in solution has been theoretically analysed using a boundary immobilization technique. The profile of the reaction front, concentration distributions, the dimensionless quantity of gas absorbed and the enhancement factor have been computed for different values of the diffusivity ratio D and the concentration ratio β. Although the concentration distribution of the dissolved reactant is dependent on D and β, that for the dissolved gas is nearly independent of these parameters for small depth of penetration. The enhancement factor shows a convex profile for small D, an explanation for which has been provided. Copyright © 1986 Canadian Society for Chemical Engineering

Journal	The Chemical Engineering Journal
Publisher	-
ISSN	0300-9467