Adiabatic and diabatic two-phase venting flow in a microchannel

David, Milnes P.; Steinbrenner, Julie E.; Miler, Josef; Goodson, Kenneth E.

doi:10.1016/j.ijmultiphaseflow.2011.06.013

Cited by 30 publications

(10 citation statements)

References 34 publications

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“…In order to measure the flow rate with a liquid flow meter (L-50CCM-D, Alicat Scientific) which has a maximum working temperature of 60 °C, the degassed liquid was cooled via heat exchange with the ambient to below 60 °C as it passed through the metal tubing (the orange line in Figure 4 between the liquid reservoir and the flow meter). The mass flux chosen in this study was G = 300 kg/m 2 s, which is a commonly used value in the literature [4,[15][16][17]. In addition, this moderate mass flux allowed for high heat flux dissipation at reasonable pressure drops and pumping powers.…”

Section: Experiments Methodology and Measurement Uncertaintymentioning

confidence: 99%

“…To suppress flow instability and to enhance heat transfer, recent studies have focused on incorporating various structures in microchannels, such as inlet restrictors [12][13][14], artificial nucleation sites [14,15], vapor venting membranes [16][17][18], micro pin fins [19][20][21], and nanowire-coated surfaces [22][23][24] integrated into the microchannel.…”

Section: Introductionmentioning

confidence: 99%

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Surface Structure Enhanced Microchannel Flow Boiling

Zhu

Antao

Chu

et al. 2016

Journal of Heat Transfer

141

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Section: Experiments Methodology and Measurement Uncertaintymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Structure Enhanced Microchannel Flow Boiling

Zhu

Antao

Chu

et al. 2016

Journal of Heat Transfer

141

View full text Add to dashboard Cite

show abstract

“…His mathematical correlation is today known as the Darcy's law. As assumed by this law, the amount of the transferred fluid is directly proportional to the pressure difference across the porous structure, as described by Equation (8) [17,18]:…”

Section: Convective Mass Transfermentioning

confidence: 99%

Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

et al. 2018

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The gas/liquid phase separation of CO2 from a water-methanol solution at the anode side of a µDirect-Methanol-Fuel-Cell (µDMFC) plays a key role in the overall performance of fuel cells. This point is of particular importance if the µDMFC is based on a “Lab-on-a-Chip” design with transient working behaviour, as well as with a recycling and a recovery system for unused fuel. By integrating a membrane-based micro contactor downstream into the µDMFC, the efficient removal of CO2 from a water-methanol solution is possible. In this work, a systematic study of the separation process regarding gas permeability with and without two-phase flow is presented. By considering the µDMFC working behaviour, an improvement of the overall separation performance is pursued. In general, the gas/liquid phase separation is achieved by (1) using a combination of the pressure gradient as a driving force, and (2) capillary forces in the pores of the membrane acting as a transport barrier depending on the nature of it (hydrophilic/hydrophobic). Additionally, the separation efficiency, pressure gradient, orientation, liquid loss, and active membrane area for different feed inlet temperatures and methanol concentrations are investigated to obtain an insight into the separation process at transient working conditions of the µDMFC.

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“…Many of these constraints were identified, and recommendations made, by David et al [7] for adiabatic and diabatic microchannels with advective flow. Xu et al [8] identified design constraints for adiabatic microchannel flows.…”

Section: Introductionmentioning

confidence: 99%

Altering Bubble Dynamics via In Situ Vapor Extraction

Fox

Juarez

Pence

et al. 2016

Heat Transfer Engineering

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Spatio-temporal cooling of electronics using latent energy might be achieved by closely spaced, rapid departure of small bubbles. One means to achieve small diameters during boiling is to provide an additional upward force during bubble formation, such as that from vapor extraction. Experiments were conducted of bubble extraction using constant flow rates of both air and vapor that ranged from 30 to 90 cubic mm per second. Extraction was achieved with a hydrophobic porous membrane sealed to a tube in which a vacuum was drawn. The gap between the extraction and supply surface was varied from 0.5 to 3.25 mm. Only individual bubbles that ruptured at the top surface while still attached to the supply surface were considered. Bubble departure diameters are approximately 80 percent of the gap height. As with unconfined bubbles in pool boiling, the bubble frequency varies inversely with departure diameter. Correlations for bubble rupture, bubble departure and bubble frequency are presented as a function of gap height. Using the three distinct regimes identified in the experimental study, i.e., growth only, growth with extraction, and extraction only, an effective bubble diameter model and an appropriate static force balance were developed. These were used to predict bubble departure frequencies and diameters, respectively, under confined extraction conditions.

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Adiabatic and diabatic two-phase venting flow in a microchannel

Cited by 30 publications

References 34 publications

Surface Structure Enhanced Microchannel Flow Boiling

Surface Structure Enhanced Microchannel Flow Boiling

Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

Altering Bubble Dynamics via In Situ Vapor Extraction

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