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Boiling and Condensing Flows and Heat Transfer

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A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Heat and Mass Transfer".

Deadline for manuscript submissions: closed (1 December 2021) | Viewed by 5497

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Dr. Sunil S. Mehendale

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Guest Editor

Manufacturing and Mechanical Engineering Technology, Michigan Technological University, Houghton, MI 49931, USA
Interests: heat exchangers; micro scale; pressure drop; void fraction; flow regimes; flow transition; flow distribution

Special Issue Information

Dear Colleagues,

Many engineering applications that are characterized by high heat fluxes involve boiling and condensing flows. The high heat transfer coefficients associated with boiling make it attractive for purposes of managing and enhancing the thermal performance of evaporators in refrigeration systems, power plant equipment, and advanced electronics equipment.The rational design of such components dictates that the associated phase change processes be well understood.

This Special Issue will aim to provide researchers with the opportunity to present and discuss their original work while also identifying future needs in this critical area of research. Papers related to boiling, condensation, heat transfer enhancement, physical and numerical modeling, as well as experimental techniques will be considered.

Suggested topics are as follows, but are not limited to:

Pool boiling and bubble dynamics

Flow boiling in micro- and macrochannels

Critical heat flux

Boiling in plate heat exchangers

Boiling in electronic cooling applications

Convective condensation in micro- and macrochannels

Enhanced condensation

Condensation in plate heat exchangers

Falling film evaporation and condensation

Boiling and condensation of mixtures

Two-phase heat transfer devices

Novel two-phase measurement and visualization techniques

Numerical simulation and modeling of boiling and condensation phenomena

Dr. Sunil Mehendale
Guest Editor

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Keywords

flow boiling
condensing flows
thermal enhancement
enhanced boiling and condensation
numerical simulation of boiling/condensing flows

Published Papers (2 papers)

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Research

17 pages, 2990 KiB

Open AccessArticle

Comparison between R134a and R1234ze(E) during Flow Boiling in Microfin Tubes

by Andrea Lucchini, Igor M. Carraretto, Thanh N. Phan, Paola G. Pittoni and Luigi P. M. Colombo

Fluids 2021, 6(11), 417; https://doi.org/10.3390/fluids6110417 - 18 Nov 2021

Cited by 4 | Viewed by 2004

Abstract

Environmental concerns are forcing the replacement of commonly used refrigerants, and finding new fluids is a top priority. Soon the R134a will be banned, and the hydro-fluoro-olefin (HFO) R1234ze(E) has been indicated as an alternative due to its smaller global warming potential (GWP) and shorter atmospheric lifetime. Nevertheless, for an optimal replacement, its thermo-fluid-dynamic characteristics have to be assessed. Flow boiling experiments (saturation temperature T_sat = 5 °C, mass flux G = 65 ÷ 222 kg·m⁻²·s⁻¹, mean quality x_m = 0.15 ÷ 0.95, quality changes ∆x = 0.06 ÷ 0.6) inside a microfin tube were performed to compare the pressure drop per unit length and the heat transfer coefficient provided by the two fluids. The results were benchmarked for some correlations. In commonly adopted operating conditions, the two fluids show a very similar behavior, while benchmark showed that some correlations are available to properly predict the pressure drop for both fluids. However, only one is satisfactory for the heat transfer coefficient. In conclusion, R1234ze(E) proved to be a suitable drop-in replacement for the R134a, whereas further efforts are recommended to refine and adapt the available predictive models. Full article

(This article belongs to the Special Issue Boiling and Condensing Flows and Heat Transfer)

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23 pages, 5602 KiB

Open AccessArticle

Experimental Characterization of the Heat Transfer in Multi-Microchannel Heat Sinks for Two-Phase Cooling of Power Electronics

by Gennaro Criscuolo, Wiebke Brix Markussen, Knud Erik Meyer, Björn Palm and Martin Ryhl Kærn

Fluids 2021, 6(2), 55; https://doi.org/10.3390/fluids6020055 - 26 Jan 2021

Cited by 6 | Viewed by 2670

Abstract

This study aims to characterize experimentally the heat transfer in micro-milled multi-microchannels copper heat sinks operating with flow boiling, in the attempt to contribute to the development of novel and high heat flux thermal management systems for power electronics. The working fluid was [...] Read more.

^{\circ}

C. The microchannels were 1 cm long and covered a square footprint area of 1

{cm}^{2}

. Boiling curves starting at low vapor quality and average heat transfer coefficients were obtained for nominal channel mass fluxes from 250

kg / m^{2} s

to 1100

kg / m^{2} s

. The measurements were conducted by gradually increasing the power dissipation over a serpentine heater soldered at the bottom of the multi-microchannels, until a maximum heater temperature of 150

^{\circ}

C was reached. Infrared thermography was used for the heater temperature measurements, while high-speed imaging through a transparent top cover provided visual access over the entire length of the channels. The average heat transfer coefficient increased with the dissipated heat flux until a decrease dependent on hydrodynamic effects occurred, possibly due to incomplete wall wetting. Depending on the channel geometry, a peak value of 200

kW / m^{2} K

for the footprint heat transfer coefficient and a maximum dissipation of 620

W / {cm}^{2}

at the footprint with a limit temperature of 150

^{\circ}

C could be obtained, showing the suitability of the investigated geometries in high heat flux cooling of power electronics. The experimental dataset was used to assess the prediction capability of selected literature correlations. The prediction method by Bertsch et al. gave the best agreement with a mean absolute percent error of 24.5%, resulting to be a good design tool for flow boiling in high aspect ratio multi-microchannels as considered in this study. Full article

(This article belongs to the Special Issue Boiling and Condensing Flows and Heat Transfer)

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