Convective heat transfer and mixing enhancement in a microchannel with a pillar

Wang, Yingying; Houshmand, Farzad; Elcock, Daren; Peles, Yoav

doi:10.1016/j.ijheatmasstransfer.2013.03.034

Cited by 63 publications

(23 citation statements)

References 19 publications

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“…A K-type thermocouple (12) recorded temperature at the flow inlet (13) through a Ni-DAQmx 9211 data acquisition card. The test piece (14) was located ahead of the Inconel foil (15), and the temperature at the flow outlet (16) was recorded by another K-type thermocouple (17). A Flir Indigo Merlin series IR camera with 25 mm lens and extension tube was used in the experiments to measure the foil temperature optically.…”

Section: Joule-heated Foilmentioning

confidence: 99%

“…Triangular features were found to be the most appropriate for heat transfer applications, as they created the smallest recirculation zones. Wang et al [16] used a resistance temperature detector and micro-PIV to measure the area-averaged heat transfer and velocity fields in a micro-channel containing circular, triangular and rhomboidal obstructions. Heat transfer data was compared with turbulent kinetic energy, which was used as a measure of flow mixing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The hydrodynamic and heat transfer behavior downstream of a channel obstruction in the laminar flow regime

Waddell

Punch

Stafford

et al. 2016

International Journal of Heat and Mass Transfer

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Section: Joule-heated Foilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The hydrodynamic and heat transfer behavior downstream of a channel obstruction in the laminar flow regime

Waddell

Punch

Stafford

et al. 2016

International Journal of Heat and Mass Transfer

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“…In this regard, an environmental scanning electron microscopy (ESEM) is an effective system in order to evaluate the three-dimensional wetting phenomena in a microstructure by the water condensation [11]. Meanwhile, in functional microchannel fabrication, it is required to design some corrugated surfaces or some pillars at an intersection among microchannels [12][13][14][15]. The authors have already discussed the guiding liquid propagation at the junction of the microchannel two-dimensionally [16].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Analysis of Liquid Propagation at Microchannel Junction using ESEM

Yagi

Kawai

2017

J. Photopol. Sci. Technol.

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The three-dimensional wetting phenomena in a T-shaped microchannel made of a SU-8 photoresist accompanying with a pillar sub-pattern are analyzed by using an environmental scanning electron microscopy (ESEM). By lowering the sample temperature in the ESEM chamber at constant the H 2 O pressure, the water condensation occurs under H 2 O dew point and the liquid propagation in the microchannel can be observed. The experimental results show that the pinning angle of water flow at T-junction is 58 degrees in the T-shaped microchannel. In the case of the T-shaped microchannel with the sub-pattern, it is found that the pinning angle becomes low by adhering the water around the sub-pattern. These results can realize to the smooth flow at the channel junction without any water trapping for the three-dimensional microfluidic devices.

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“…The results showed that among different cross section shapes, the sine-shaped pin-fin performed best when considering pressure penalty. The heat transfer of a microchannel with pin-fin in a large range of Reynolds numbers was experimentally studied by Wang et al [13]. The results showed its heat transfer coefficient was twice that of the plate microchannel.…”

Section: Introductionmentioning

confidence: 99%

Effects of Endwall Fillet and Bulb on the Temperature Uniformity of Pin-Fined Microchannel

Pan

et al. 2017

Entropy

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Endwall fillet and bulb structures are proposed in this research to improve the temperature uniformity of pin-fined microchannels. The periodical laminar flow and heat transfer performances are investigated under different Reynolds numbers and radius of fillet and bulb. The results show that at a low Reynolds number, both the fillet and the bulb structures strengthen the span-wise and the normal secondary flow in the channel, eliminate the high temperature area in the pin-fin, improve the heat transfer performance of the rear of the cylinder, and enhance the thermal uniformity of the pin-fin surface and the outside wall. Compared to traditional pin-fined microchannels, the flow resistance coefficient f of the pin-fined microchannels with fillet, as well as a bulb with a 2 µm or 5 µm radius, does not increase significantly, while, f of the pin-fined microchannels with a 10 µm or 15 µm bulb increases notably. Moreover, Nu has a maximum increase of 16.93% for those with fillet and 20.65% for those with bulb, and the synthetic thermal performance coefficient TP increases by 16.22% at most for those with fillet and 15.67% at most for those with bulb. At last, as the Reynolds number increases, heat transfer improvement of the fillet and bulb decreases.

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Convective heat transfer and mixing enhancement in a microchannel with a pillar

Cited by 63 publications

References 19 publications

The hydrodynamic and heat transfer behavior downstream of a channel obstruction in the laminar flow regime

The hydrodynamic and heat transfer behavior downstream of a channel obstruction in the laminar flow regime

Three-Dimensional Analysis of Liquid Propagation at Microchannel Junction using ESEM

Effects of Endwall Fillet and Bulb on the Temperature Uniformity of Pin-Fined Microchannel

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