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Energies
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Experimental Measurements and Numerical Modelling of Boiling and Condensation Heat...
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Experimental Measurements and Numerical Modelling of Boiling and Condensation Heat Transfer

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 2977

Special Issue Editor

Dr. Anastasios Georgoulas

E-Mail Website
Guest Editor
Advanced Engineering Centre, School of Architecture Technology and Engineering, University of Brighton, Brighton BN2 4AT, UK
Interests: computational fluid dynamics (CFD) modeling of diabatic two-phase flows with phase change (pool boiling, flow boiling, cavitation); turbulent multiphase flows (water–sediment/turbidity currents, water–air/free-surface flows); heat and mass transfer; aerodynamics; HVAC
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Special Issue Information

Dear Colleagues,

A wide variety of engineering systems and components are based on boiling and condensation heat transfer. Conventional single-phase flow cooling methods such as forced air and liquid convection have already reached thermal capacity bottlenecks. Especially for thermal management purposes of high-power-density equipment, boiling and condensation processes are becoming very attractive due to the high heat transfer coefficients that are associated with the underpinned latent heat of evaporation and/or condensation. Therefore, the application of high-resolution experimental measurements as well as advanced multiphase numerical modelling approaches for studying boiling and condensation processes is of high importance for understanding and quantifying the complex underpinned two-phase flow and heat transfer characteristics, aiding in the proper design of such systems. 

The present Special Issue will aim to provide research groups internationally with the opportunity to present original investigations related to boiling and condensation heat transfer. Experimental, numerical and theoretical investigations are welcome on the following suggested topics (other directly or indirectly relevant topics will also be considered):

  • Pool boiling and bubble dynamics;
  • Flow boiling in in micro- and macrochannels;
  • Convective condensation in micro- and macrochannels;
  • Dropwise condensation;
  • Boiling and condensation in two-phase passive and active heat-transfer devices (e.g., heat pipes, pulsating heat pipes, loop heat pipes, microchannel heat sinks);
  • Modelling of nucleation.

Dr. Anastasios Georgoulas
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

  • pool boiling
  • flow boiling
  • convective condensation
  • dropwise condensation
  • two-phase heat transfer devices
  • nucleation

Published Papers (2 papers)

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Research

26 pages, 2122 KiB  
Article
Validation of the Eulerian–Eulerian Two-Fluid Method and the RPI Wall Partitioning Model Predictions in OpenFOAM with Respect to the Flow Boiling Characteristics within Conventional Tubes and Micro-Channels
by Konstantinos Vontas, Marco Pavarani, Nicolas Miché, Marco Marengo and Anastasios Georgoulas
Energies 2023, 16(13), 4996; https://doi.org/10.3390/en16134996 - 27 Jun 2023
Viewed by 1275
Abstract
Flow boiling within conventional, mini and micro-scale channels is encountered in a wide range of engineering applications such as nuclear reactors, steam engines and cooling of electronic devices. Due to the high complexity and importance of the boiling process, several numerical and experimental [...] Read more.
Flow boiling within conventional, mini and micro-scale channels is encountered in a wide range of engineering applications such as nuclear reactors, steam engines and cooling of electronic devices. Due to the high complexity and importance of the boiling process, several numerical and experimental investigations have been conducted for the better understanding of the underpinned physics and heat transfer characteristics. One of the most widely used numerical approaches that can analyse such phenomena is the Eulerian–Eulerian two-fluid method in conjunction with the RPI model. However, according to the current state-of-the-art methods this modelling approach heavily relies on empirical closure relationships derived for conventional channels, limiting its applicability to mini- and micro-scale channels. The present paper aims to give further insights into the applicability of this modelling approach for non-conventional channels. For this purpose, a numerical investigation utilising the Eulerian–Eulerian two-fluid model and the RPI wall heat flux partitioning model in OpenFOAM 8.0 is conducted. Initially the parameters comprising the empirical closure relationships used in the RPI sub-models are tuned against the DEBORA experiments on conventional channels, through an extensive sensitivity analysis. In the second part of the investigation, numerical simulations against flow boiling experiments within micro-channels are performed, utilising the previously optimised and validated model setup. Furthermore the importance of including a bubble coalescence and break-up sub-model to capture parameters such as the radial velocity profiles, is also illustrated. However, when the optimal model setup, in conventional tubes, is used against micro-channel experiments, the need to develop new correlations from data obtained from mini and micro-scale channel studies, not from experimental data on conventional channels, is revealed. Full article
(This article belongs to the Special Issue Experimental Measurements and Numerical Modelling of Boiling and Condensation Heat Transfer)
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22 pages, 6651 KiB  
Article
Numerical Simulation of Vapor Dropwise Condensation Process and Droplet Growth Mode
by Yali Guo, Run Wang, Denghui Zhao, Luyuan Gong and Shengqiang Shen
Energies 2023, 16(5), 2442; https://doi.org/10.3390/en16052442 - 03 Mar 2023
Cited by 3 | Viewed by 1289
Abstract
Compared with film condensation, dropwise condensation based on droplet growth can significantly improve the condensing equipment’s water collection and thermal efficiency in the vapor condensate system. Therefore, as a critical behavior affecting the evolution of dropwise condensation, research on droplet growth is of [...] Read more.
Compared with film condensation, dropwise condensation based on droplet growth can significantly improve the condensing equipment’s water collection and thermal efficiency in the vapor condensate system. Therefore, as a critical behavior affecting the evolution of dropwise condensation, research on droplet growth is of great significance to further understanding the evolutionary characteristics and heat transfer mechanism of dropwise condensation. In this paper, a model for simulating the entire evolution process of dropwise condensation is improved and constructed, and the evolution process of dropwise condensation with different condensation nucleus densities on the vertical wall is simulated based on certain assumptions. Moreover, parameters such as evolution rate and size contribution are proposed to measure droplet growth’s influence on the evolution process of dropwise condensation. In the simulation, the Cassie model was used to describe the condensation growth of droplets. The neighbor finding algorithm and conservation law are coupled to simulate the coalescence growth process of droplets. Through the comparison of the theoretical model and experimental results, it is indicated that the simulation method in this paper is highly reliable. The simulation results demonstrate that more than 95% of the maximum droplet size of dropwise condensation is derived from coalescence growth, and its growth rate can characterize the evolution rate of dropwise condensation. The evolution rate reveals a linear growth trend with the increase of condensate nucleus density, and the average heat flux shows an increasing trend followed by a decreasing trend, reaching the peak, qaverage = 30.5 kW·m−2, at the NS = 5 × 109 m−2. The surfaces with a high coalescence frequency can increase the contribution of the coalescence growth to the maximum droplet size more effectively and, conversely, the contribution of condensation growth is weakened, which is less than 1% at the NS = 7.5 × 109 m−2. Full article
(This article belongs to the Special Issue Experimental Measurements and Numerical Modelling of Boiling and Condensation Heat Transfer)
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