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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

TRANSPORT PROCESSES AND SEPARATION IN ZERO-GRAVITY DISTILLATION

Niklas Preußer
Institute for Technical Thermodynamics, Technische Universität Darmstadt, 64287 Darmstadt, Germany

S. Rieks
Chair of Fluid Process Engineering, Paderborn University, 33098 Paderborn, Germany

Eugeny Y. Kenig
Chair of Fluid Process Engineering, Paderborn University, 33098 Paderborn, Germany

Peter Stephan
Institute for Technical Thermodynamics, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Tatiana Gambaryan-Roisman
Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitat Darmstadt, Alarich-Weiss-Str. 10, 64287, Darmstadt, Germany

DOI: 10.1615/IHTC16.her.023300
pages 4575-4582


KEY WORDS: Micro distillation, heat pipe, binary mixtures, separation processes, measurement and simulation

Abstract

Zero-gravity distillation is a micro distillation process, in which the liquid flow is driven by capillary forces, similar to a heat pipe. In this study, the separation of ethanol-methanol mixtures in a zero-gravity distillation apparatus is investigated. Heat fluxes, temperature profiles and the fluid interface evolution are evaluated. The results show larger temperature differences between condenser and evaporator for a fluid mixture than for the pure fluids. For the investigated heat fluxes, the curvature change is dominated by gravitational forces. The curvature distribution is in good agreement with a numerical model. The results show that the process can be successfully used to separate an ethanol-methanol mixture despite the narrow vapour-liquid equilibrium of this fluid system. Under the conditions studied in this work, the separation efficiency of the process does not significantly depend on the heat flux.

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