A novel device for the optical investigation of phase transition in micro channel array evaporators

Maikowske, Stefan; Brandner, Juergen J.; Lange, Rüdiger

doi:10.1016/j.applthermaleng.2010.02.015

Cited by 17 publications

(12 citation statements)

References 15 publications

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“…The simulation is carried out using a symmetrical domain with a symmetry plane at z = 0.1mm, which results in the actual microchannel width of 0.2mm. The channel size corresponds to the smallest channels in the microchannel-array from the investigation performed by Maikowske, Brandner & Lange [6]. Figure 1 and Table 1 summarize further details of the simulation setup.…”

Section: Numerical Domainmentioning

confidence: 99%

“…This phenomena is accompanied by pulsating pressure, reversed flow or blockage of the microchannel-array. The current investigation is inspired by a series of experiments previously carried out at the Institute for Micro Process Engineering at KIT in Karlsruhe, Germany [6][7][8], which provide the necessary key data for the numerical setup. In order to gain a better physical understanding of the governing parameters of the boiling flow in the experimentally investigated microchannels we investigate the effects of the prescribed flow velocity, temperature distribution and initial position on the growth and motion of the vapor bubble using numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Vapor Bubble Growth in a Rectangular Microchannel

Stroh

Dittmeyer

2018

International Heat Transfer Conference 16

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A numerical simulation of a rectangular microchannel with partially superheated wall area is carried out in order to gain better understanding of the physical mechanism behind boiling in such confined geometries. Variation of the initial bubble position and boundary conditions for temperature and velocity fields is performed to extract the distinct influence on the vapor bubble growth. A significant difference in the motion and growth of the vapor bubble is observed depending on the operating conditions.

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Section: Numerical Domainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Vapor Bubble Growth in a Rectangular Microchannel

Stroh

Dittmeyer

2018

International Heat Transfer Conference 16

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“…Different vapor clogging phenomena led to flow maldistributions and hence to inhomogeneous vapor quality at the vapor outlet of microchannel arrays. 94 Meng et al 95 stated that methods like ''bypassing'', ''trapping'' and ''special shapes'' of microchannels can tolerate limited amounts of gas within the microchannels, but do not solve the bubble clogging problem itself. If gas is generated constantly during processing, efficient gas removal out of the microchannels is needed.…”

Section: Chemcomm Feature Articlementioning

confidence: 99%

Fouling in microstructured devices: a review

et al. 2015

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Microstructured devices are widely used for manufacturing products that benefit from process intensification, with pharmaceutical products or specialties of the chemical industry being prime examples. These devices are ideally used for processing pure fluids. Where particulate or non-pure flows are involved, processes are treated with utmost caution since related fouling and blocking issues present the greatest barrier to operating microstructured devices effectively. Micro process engineering is a relatively new research field and there is limited understanding of fouling in these dimensions and its underlying processes and phenomena. A comprehensive review on fouling in microstructured devices would be helpful in this regard, but is currently lacking. This paper attempts to review recent developments of fouling in micro dimensions for all fouling categories (crystallization, particulate, chemical reaction, corrosion and biological growth fouling) and the sequential events involved (initiation, transport, attachment, removal and aging). Compared to fouling in macro dimensions, an additional sixth category is suggested: clogging by gas bubbles. Most of the reviewed papers present very specific fouling investigations making it difficult to derive general rules and parameter dependencies, and comparative or critical considerations of the studies were difficult. We therefore used a statistical approach to evaluate the research in the field of fouling in microchannels.

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“…These can be employed to record the block temperature and can be connected to the temperature controller as feedback sensors. This configuration allows the imposition of controlled temperature boundary conditions below the channel sections and the possibility of achieving steep temperature profiles along the microchannel bottom wall [17].…”

Section: Methodsmentioning

confidence: 99%