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Two-Phase Flow with Boiling Heat Transfer
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Two-Phase Flow with Boiling Heat Transfer

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 15387

Special Issue Editor

Prof. Dr. Byoung Jae Kim

E-Mail Website
Guest Editor
School of Mechanical Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea
Interests: two-phase flow modeling/simulation; phase change phenomena; nuclear safety; flow visualization

Special Issue Information

Dear Colleagues,

The Guest Editor cordially invites submissions to a Special Issue of Energies on the subject “Two-Phase Flow with Boiling Heat Transfer”. Boiling heat transfer has been widely used to provide efficient heat removal in energy systems with the help of latent heat exchange between liquid and vapor. Recently, various efforts have been made to understand the pool/flow boiling mechanism using advanced experimental and numerical techniques and to propose innovative methods to improve heat transfer efficiency in energy systems. This Special Issue will deal with recent research in the field of two-phase flow with boiling heat transfer. Topics of interest include, but are not limited to:

  • Numerical modeling and simulation of boiling phenomena;
  • Advanced measurement techniques of boiling phenomena;
  • Pool boiling and bubble dynamics;
  • Critical heat flux;
  • Film boiling;
  • Boiling in practical applications;
  • Boiling enhancement techniques;
  • Interfacial phenomena

Submit your paper and select the Journal “Energies” and the Special Issue “Two-Phase Flow with Boiling Heat Transfer” via: MDPI submission system. Please contact the special issue editor ([email protected]) for any queries. Our papers will be published on a rolling basis and we will be pleased to receive your submission once you have finished it.

Prof. Dr. Byoung Jae Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Two-phase flow
  • Boiling phenomena
  • Two-phase flow measurement
  • Two-phase flow simulation
  • Two-phase flow modeling
  • Boiling enhancement
  • Energy system

Published Papers (7 papers)

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Research

27 pages, 5230 KiB  
Article
Experimental Flow Boiling Study of R245a at High Reduced Pressures in a Large Diameter Horizontal Tube
by Alihan Kaya, Steven Lecompte and Michel De Paepe
Energies 2022, 15(3), 864; https://0-doi-org.brum.beds.ac.uk/10.3390/en15030864 - 25 Jan 2022
Cited by 6 | Viewed by 2052
Abstract
Evaporators used in organic Rankine cycles (ORC) are designed using existing flow boiling correlations that are mainly based on HVAC&R data. However, the ORC evaporators employed in the industry typically have larger diameters and operational conditions at higher reduced pressures compared to the [...] Read more.
Evaporators used in organic Rankine cycles (ORC) are designed using existing flow boiling correlations that are mainly based on HVAC&R data. However, the ORC evaporators employed in the industry typically have larger diameters and operational conditions at higher reduced pressures compared to the HVAC&R applications. The present study presents the results of flow boiling heat transfer experiments in operational conditions that are representative for an industrial waste heat recovery low-temperature ORC’s evaporator tube, by being performed at high reduced pressures and in a large-diameter horizontal tube with R245fa as working fluid. The measurements are performed within a range of mass flux, saturation temperature and heat flux at 83–283 kg/m2s, 85–120 °C (8.9–19.2 bar) and 17–29 kW/m2, respectively. Test section is a round and plain horizontal carbon steel tube with 21 mm I.D., 2.5 m length. 513 local two-phase heat transfer coefficients are recorded. The experimental results are compared with each other to reveal heat transfer coefficient trends with respect to varying experimental conditions. Four distinctive heat transfer zones are observed, namely, the nucleate boiling dominant (NBD) zone, weakening nucleate boiling dominance (WNBD) zone, flow boiling zone (FBZ) and the dry-out zone (DOZ). Heat transfer coefficient vs vapor quality trends partly resembled CO2 flow boiling results reported in the literature. Two flow boiling correlations moderately predicted the data. Full article
(This article belongs to the Special Issue Two-Phase Flow with Boiling Heat Transfer)
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24 pages, 8516 KiB  
Article
Experimental Investigation of the Heat Transfer Characteristics and Operation Limits of a Fork-Type Heat Pipe for Passive Cooling of a Spent Fuel Pool
by Changhwan Lim, Jonghwi Choi and Hyungdae Kim
Energies 2021, 14(23), 7862; https://0-doi-org.brum.beds.ac.uk/10.3390/en14237862 - 24 Nov 2021
Cited by 4 | Viewed by 2210
Abstract
A fork-type heat pipe (FHP) is a passive heat-transport and air-cooling device used to remove the decay heat of spent nuclear fuels stored in a liquid pool during a station blackout. FHPs have a unique geometrical design to resolve the significant mismatch between [...] Read more.
A fork-type heat pipe (FHP) is a passive heat-transport and air-cooling device used to remove the decay heat of spent nuclear fuels stored in a liquid pool during a station blackout. FHPs have a unique geometrical design to resolve the significant mismatch between the convective heat transfer coefficients of the evaporator and condenser parts. The evaporator at the bottom is a single heat-exchanger tube, whereas the condenser at the top consists of multiple finned tubes to maximize the heat transfer area. In this study, the heat transfer characteristics and operating limits of an FHP device were investigated experimentally. A laboratory-scale model of an FHP was manufactured, and a series of tests were conducted while the temperature was varied to simulate a spent fuel pool. As an index of the average heat transfer performance, the loop conductance was computed from the measurement data. The results show that the loop conductance of the FHP increased with the heat transfer rate but deteriorated significantly at the operating limit. The maximum attainable heat transfer rate of the unit FHP model was accurately predicted by the existing correlations of the counter-current flow limit for a single-rod-type heat pipe. In addition, the instant heat transfer behaviors of the FHP model under different temperature conditions were examined to interpret the measured loop conductance variation and operating limit. Full article
(This article belongs to the Special Issue Two-Phase Flow with Boiling Heat Transfer)
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13 pages, 5085 KiB  
Article
Experimental Study on Pool Boiling on Hydrophilic Micro/Nanotextured Surfaces with Hydrophobic Patterns
by Hak Rae Cho, Su Cheong Park, Doyeon Kim, Hyeong-min Joo and Dong In Yu
Energies 2021, 14(22), 7543; https://0-doi-org.brum.beds.ac.uk/10.3390/en14227543 - 11 Nov 2021
Cited by 6 | Viewed by 2216
Abstract
Over the past decades, pool boiling on various wetting surfaces has been intensively investigated to enhance boiling heat transfer and critical heat flux. In this study, to enhance the two thermal performances simultaneously, we developed hydrophilic micro/nanotextured surfaces with hydrophobic patterns. Using a [...] Read more.
Over the past decades, pool boiling on various wetting surfaces has been intensively investigated to enhance boiling heat transfer and critical heat flux. In this study, to enhance the two thermal performances simultaneously, we developed hydrophilic micro/nanotextured surfaces with hydrophobic patterns. Using a silicon substrate, well-arrayed microtextures and randomly arrayed nanotextures were fabricated hierarchically using micro/nanoelectromechanical system processes. The top of the microtextures was coated locally with hydrophobic characteristics using specific self-assembled monolayer coating methods. Based on experimental data, we postulate that the critical heat flux was enhanced by the capillary-induced flow between microtextures and that nanotextures with superhydrophilicity contribute to the delay of the critical heat flux by better wetting the dried area. Owing to the hydrophobicity at the top of the micropillars, the nucleate site density and boiling heat transfer increased. Full article
(This article belongs to the Special Issue Two-Phase Flow with Boiling Heat Transfer)
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14 pages, 4376 KiB  
Article
An Experimental Performance Evaluation for a Swirl-Vane Separator Using an Air-Water Test Facility
by Kihwan Kim, Woo-Shik Kim and Jae-Bong Lee
Energies 2021, 14(21), 7072; https://0-doi-org.brum.beds.ac.uk/10.3390/en14217072 - 28 Oct 2021
Cited by 1 | Viewed by 1754
Abstract
The most important design parameters of a moisture separator to optimize the efficiency of a nuclear power plant are the moisture carry over and pressure drop. An air-water test facility was constructed to evaluate the design parameters for various types of conventional moisture [...] Read more.
The most important design parameters of a moisture separator to optimize the efficiency of a nuclear power plant are the moisture carry over and pressure drop. An air-water test facility was constructed to evaluate the design parameters for various types of conventional moisture separators in Korea. In this study, a half scale of swirl-vane separator was designed, and test conditions were defined based on the scaling law to cover a wide range of operating conditions. The moisture carry over was measured using an isokinetic sampling system for 34 different flow conditions. The MCO was in range of 0.30–7.05% according to the test conditions. Single and two-phase flow experiments were also carried out to identify the two-phase pressure drop characteristics. Based on the obtained results, the proposed empirical correlation model was extended to a submerged separator and applying these results to a full scale system is discussed in this paper. Full article
(This article belongs to the Special Issue Two-Phase Flow with Boiling Heat Transfer)
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30 pages, 20540 KiB  
Article
Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations
by Magdalena Piasecka and Kinga Strąk
Energies 2021, 14(16), 4891; https://0-doi-org.brum.beds.ac.uk/10.3390/en14164891 - 10 Aug 2021
Cited by 9 | Viewed by 1516
Abstract
This paper reports the results of heat transfer during refrigerant flow in rectangular mini-channels at stationary conditions. The impacts of selected parameters on boiling are discussed, i.e., thermal and flow parameters, dimensions and orientation of the channels. Four refrigerants (FC-72, HFE-649, HFE-7000 and [...] Read more.
This paper reports the results of heat transfer during refrigerant flow in rectangular mini-channels at stationary conditions. The impacts of selected parameters on boiling are discussed, i.e., thermal and flow parameters, dimensions and orientation of the channels. Four refrigerants (FC-72, HFE-649, HFE-7000 and HFE-7100) were used as the working fluid. Research was carried out on the experimental set-up with the test section with a single rectangular mini-channel of 180 mm long and with a group of five parallel mini-channels, each 32 mm long. The temperature of the mini-channel’s heated wall was measured by infrared thermography. Local values of the heat transfer coefficient at the contact surface between the fluid and the plate were calculated using the 1D mathematical method. The results are presented as the relationship between the heat transfer coefficient and the distance along the mini-channel length and boiling curves. Two-phase flow patterns are shown. Moreover, the results concerning various refrigerants and the use of modified heater surfaces are discussed. The main factors influencing the heat transfer process were: mini-channel inclination to the horizontal pane (the highest heat transfer coefficient at 270° and 0°), using modified heater surfaces (especially electroerosion texturing and vibration-assisted laser No. 2 texturing) and working fluids (FC-72 and HFE-7000). Full article
(This article belongs to the Special Issue Two-Phase Flow with Boiling Heat Transfer)
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15 pages, 4974 KiB  
Article
Evaporation of Methanol Solution for a Methanol Steam Reforming System
by Ngoc Van Trinh, Younghyeon Kim, Hongjip Kim and Sangseok Yu
Energies 2021, 14(16), 4862; https://0-doi-org.brum.beds.ac.uk/10.3390/en14164862 - 09 Aug 2021
Cited by 1 | Viewed by 3138
Abstract
In a methanol-reforming system, because the mixture of methanol and water must be evaporated before reaching the reforming reaction zone, having an appropriate evaporator design is a fundamental requirement for completing the reforming reaction. This study investigates the effect of the evaporator design [...] Read more.
In a methanol-reforming system, because the mixture of methanol and water must be evaporated before reaching the reforming reaction zone, having an appropriate evaporator design is a fundamental requirement for completing the reforming reaction. This study investigates the effect of the evaporator design for the stable reforming of methanol–water mixtures. Four types of evaporator are compared at the same heat duty of the methanol-reforming system. The four evaporators are planar heat exchangers containing a microchannel structure, cylindrical shell-and-tube evaporators, zirconia balls for internal evaporation, and combinations of cylindrical shell-tubes and zirconia balls. The results show that the evaporator configuration is critical in performing stable reform reactions, especially for the flow-field mode of the evaporator. Additionally, the combination of both internal and external evaporation methods generates the highest performance for the methanol-reforming system, with the methanol conversion reaching almost 98%. Full article
(This article belongs to the Special Issue Two-Phase Flow with Boiling Heat Transfer)
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13 pages, 3521 KiB  
Article
Development of Empirical Correlation of Two-Phase Pressure Drop in Moisture Separator Based on Separated Flow Model
by Woo-Shik Kim, Jae-Bong Lee and Ki-Hwan Kim
Energies 2021, 14(15), 4448; https://0-doi-org.brum.beds.ac.uk/10.3390/en14154448 - 23 Jul 2021
Cited by 6 | Viewed by 1534
Abstract
Pressure drop across the moisture separator installed in the steam generator of a nuclear power plant affects the power generation efficiency, and so accurate pressure drop prediction is important in generator design. In this study, an empirical correlation is proposed for predicting the [...] Read more.
Pressure drop across the moisture separator installed in the steam generator of a nuclear power plant affects the power generation efficiency, and so accurate pressure drop prediction is important in generator design. In this study, an empirical correlation is proposed for predicting the two-phase pressure drop through a moisture separator. To ensure the applicability of the correlation, a series of two-phase air-water experiments were performed, and the results of the present test and of the benchmark test of high-pressure steam-water were used in developing the correlation. Based on the experimental results, quality, dimensionless superficial velocity, density ratio of the working fluid, and the geometrical factor were considered to be important parameters. The two-phase pressure drop multiplier was expressed in terms of these parameters. The empirical correlation was found to predict the experimental results within a reasonable range. Full article
(This article belongs to the Special Issue Two-Phase Flow with Boiling Heat Transfer)
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