Pressure Drop Measurements With Boiling in Diverging Microchannel

Agrawal, Amit; Duryodhan, V. S.; Singh, Shiv Govind

doi:10.5098/hmt.v3.1.3005

Cited by 17 publications

(3 citation statements)

References 26 publications

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“…The microchannel with inlet restrictor showed less instability and performed well at the higher heat flux. The reduction in flow boiling instability using diverging microchannel was studied by Agrawal et al [6]. Three different divergence angles of 4, 8 and 12 were studied which showed that the pressure drop and instability reduce during flow boiling in microchannel with divergence angle of 12.…”

Section: Introductionmentioning

confidence: 99%

Effect of Outlet Plenum Volume During Flow Boiling Inside Plain Parallel Microchannel

Hedau¹,

Raj²,

Saha³

2020

World Congress on Momentum, Heat and Mass Transfer

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In this paper, the effect of outlet plenum volume in reducing instability and enhanced thermal performance during flow boiling inside fourteen parallel copper plain microchannel is reported. Two different sets of outlet plenum design are studied having the outlet plenum volume same as the inlet plenum volume (V1) and the outlet plenum volume with eight times of the volume of inlet plenum (V8). The plain microchannel with the V8 microchannel shows 4.5 ℃ less surface temperature compared to that with the V1 microchannel for the mass flux of 250 kg/m 2 s and heat flux of 220 W/cm 2. The larger outlet plenum volume efficiently removes vapour generated inside the microchannel, thereby reducing the fluctuations in temperature, pressure drop and mass flux during flow boiling.

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Section: Introductionmentioning

confidence: 99%

Effect of Outlet Plenum Volume During Flow Boiling Inside Plain Parallel Microchannel

Hedau¹,

Raj²,

Saha³

2020

World Congress on Momentum, Heat and Mass Transfer

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“…Hsieh et al (2013) used a heated converging-diverging microchannel to stretch DNA molecules using thermoelectrophoresis and convection. Some efforts have also been made to reduce flow boiling instabilities by employing a diverging microchannel (Agrawal et al, 2012;Lee and Pan, 2008). Xuan et al (2005) employed converging-diverging microchannel for particle separation using electrophoretic separation technique.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Study of Conjugate Heat Transfer in Diverging Microchannel

Duryodhan

Singh²,

Singh³

et al. 2016

Proceedings of the Indian National Science Academy

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Increase in applications of varying cross sectional area microchannels in microdevices has provided the need to understand fluid flow and heat transfer through such flow passages. This study focuses on conjugate heat transfer study through a diverging microchannel. Three-dimensional numerical simulations are performed using commercially available package. Diverging microchannels with different geometrical configurations (i.e. varying angle: 1-8°, depth: 86-200 µm, solid-tofluid thickness ratio: 1.5-4) are employed for this purpose. Simulations are carried out for varying mass flow rate (3.3 x 10 -5 -8.3 x 10 -5 kg/s) and heat flux (2.4-9.6 W/cm 2 ) conditions. Heat distribution along the flow direction is studied to understand the effect of wall conduction. Wall conduction number (M) varies from 0.006 to 0.024 for the range of parameters selected in the study. Wall conduction is observed to be a direct function of depth and solid-to-fluid thickness ratio, and varies inversely with angle of diverging microchannel. It is observed that the area variation and wall conduction contribute separately towards redistribution of the supplied heat flux. This leads to reduced temperature gradients in diverging microchannel. The results presented in this work will be useful for designing future microdevices involving heating or cooling.

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“…Lee and Pan (2008) employed a diverging microchannel to reduce flow instability during flow boiling in the microchannel. Agrawal et al (2012) and Duryodhan et al (2013a) performed boiling experiments on diverging microchannels with various divergence angles and found that diverging microchannels are useful for reducing boiling flow instability. Stemme and Stemme (1993) fabricated and tested a novel valve-less micropump using a nozzle-diffuser arrangement in brass metal.…”

Section: Introductionmentioning

confidence: 99%

Liquid flow through converging microchannels and a comparison with diverging microchannels

Duryodhan

Singh

Agrawal

2014

J. Micromech. Microeng.

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Diverging and converging microchannels are becoming an important part of microdevices. In this work, an experimental study of liquid flow through converging microchannels is performed and analyzed using results from 3D numerical simulations. Converging microchannels of various configurations: hydraulic diameter (118–177 µm), length (10–30 mm) and convergence angle (4°–12°) are used to measure the pressure drop for a volume flow rate range of 0.5–5 ml min−1 (8.33 10−6–8.33 10−5 kg s−1) using deionised water as the working fluid. It is observed that the pressure drop in a converging microchannel varies non-linearly with the volume flow rate, and inversely with the convergence angle and hydraulic diameter. An equivalent hydraulic diameter is introduced in order to predict the overall pressure drop through the converging microchannel using the established theory for straight microchannels. The equivalent hydraulic diameter of the converging microchannel lies at 1/3.6th of the total length from the narrowest width of the microchannel; compared with 1/3rd for the diverging microchannel. A comparative analysis of flow through diverging and converging microchannels is also performed. It is shown that fluidic diodicity varies asymptotically with the angle and length of microchannels, whereas it increases with the volume flow rate. A theoretical expression for diodicity is also derived. The maximum fluidic diodicity is found to lie between 1.2 and 1.3. The data presented in this work is of fundamental importance and can help in optimizing the design of various microdevices.

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Pressure Drop Measurements With Boiling in Diverging Microchannel

Cited by 17 publications

References 26 publications

Effect of Outlet Plenum Volume During Flow Boiling Inside Plain Parallel Microchannel

Effect of Outlet Plenum Volume During Flow Boiling Inside Plain Parallel Microchannel

Three-Dimensional Numerical Study of Conjugate Heat Transfer in Diverging Microchannel

Liquid flow through converging microchannels and a comparison with diverging microchannels

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