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Selected Papers from the 16th UK Heat Transfer Conference (UKHTC2019)

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

Deadline for manuscript submissions: closed (28 February 2020) | Viewed by 17375

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Dr. Chuang Wen

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Guest Editor

Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK
Interests: clean energy; energy storage; heat and mass transfer; fluid flow
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Yuying Yan

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Guest Editor

Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK
Interests: heat transfer; fluid flow; multi-scale modelling of boiling in microchannel, micro nano fluids flow and heat transfer; biomimetics of functional surfaces with fluids; efficient cooling technology; thermoelectric applications; solid descant dehumidification systems for HVAC

Special Issue Information

Dear Colleagues,

The UK Heat Transfer Conference is organised under the aegis of the UK National Heat Transfer Committee every two years, and it is the premier forum in the UK for the local and international heat transfer community to meet, disseminate ongoing work and discuss the latest advances in the heat transfer field. For the 16th UK Heat Transfer Conference (UKHTC 2019), topics include, but are not limited to, the following:

Single-phase heat transfer;
Boiling, evaporation and condensation;
Computational heat transfer;
Multi-phase flow;
Cooling of electronics and other high-heat flux devices;
Heat pipes;
Thermal management;
Air conditioning and refrigeration;
Gas turbines, engines, combustion;
Heat exchangers;
Enhanced heat transfer;
Environmental heat transfer;
Heat transfer at the micro and nano scales;
Nanofluids;
Porous media;
Energy recovery and heat integration;
Heat transfer and thermodynamics for the automotive industry;
Heat transfer for aerospace;
Nature-inspired solutions for flow and heat transfer;
Drying;
Heat transfer technology for sustainable energy—fuel cells, solar energy, energy storage, etc.

Dr. Chuang Wen
Prof. Dr. Yuying Yan
Guest Editors

Manuscript Submission Information

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Keywords

Energy efficiency
Thermal engineering
Energy storage
Thermal management
Renewable energy
Heat and mass transfer

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Published Papers (4 papers)

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Research

15 pages, 5592 KiB

Open AccessArticle

Numerical and Experimental Studies on the Effect of Surface Roughness and Ultrasonic Frequency on Bubble Dynamics in Acoustic Cavitation

by Rana Altay, Abdolali K. Sadaghiani, M. Ilker Sevgen, Alper Şişman and Ali Koşar

Energies 2020, 13(5), 1126; https://doi.org/10.3390/en13051126 - 3 Mar 2020

Cited by 30 | Viewed by 5481

Abstract

With many emerging applications such as chemical reactions and ultrasound therapy, acoustic cavitation plays a vital role in having improved energy efficiency. For example, acoustic cavitation results in substantial enhancement in the rates of various chemical reactions. In this regard, an applied acoustic field within a medium generates acoustic streaming, where cavitation bubbles appear due to preexisting dissolved gas in the working fluid. Upon cavitation inception, bubbles can undergo subsequent growth and collapse. During the last decade, the studies on the effects of different parameters on acoustic cavitation such as applied ultrasound frequency and power have been conducted. The bubble growth and collapse mechanisms and their distribution within the medium have been classified. Yet, more research is necessary to understand the complex mechanism of multi-bubble behavior under an applied acoustic field. Various parameters affecting acoustic cavitation such as surface roughness of the acoustic generator should be investigated in more detail in this regard. In this study, single bubble lifetime, bubble size and multi-bubble dynamics were investigated by changing the applied ultrasonic field. The effect of surface roughness on bubble dynamics was presented. In the analysis, images from a high-speed camera and fast video recording techniques were used. Numerical simulations were also done to investigate the effect of acoustic field frequency on bubble dynamics. Bubble cluster behavior and required minimum bubble size to be affected by the acoustic field were obtained. Numerical results suggested that bubbles with sizes of 50 µm or more could be aligned according to the radiation potential map, whereas bubbles with sizes smaller than 10 µm were not affected by the acoustic field. Furthermore, it was empirically proven that surface roughness has a significant effect on acoustic cavitation phenomena. Full article

(This article belongs to the Special Issue Selected Papers from the 16th UK Heat Transfer Conference (UKHTC2019))

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19 pages, 6542 KiB

Open AccessArticle

Modelling and Evaluation of the Thermohydraulic Performance of Finned-Tube Supercritical Carbon Dioxide Gas Coolers

by Lei Chai, Konstantinos M. Tsamos and Savvas A. Tassou

Energies 2020, 13(5), 1031; https://doi.org/10.3390/en13051031 - 25 Feb 2020

Cited by 13 | Viewed by 3268

Abstract

This paper investigates the thermohydraulic performance of finned-tube supercritical carbon dioxide (sCO₂) gas coolers operating with refrigerant pressures near the critical point. A distributed modelling approach combined with the ε-NTU method has been developed for the simulation of the gas cooler. The heat transfer and pressure drop for each evenly divided segment are calculated using empirical correlations for Nusselt number and friction factor. The model was validated against test results and then used to investigate the influence of design and operating parameters on local and overall gas cooler performance. The results show that the refrigerant heat-transfer coefficient increases with decreasing temperature and reaches its maximum close to the pseudocritical temperature before beginning to decrease. The pressure drop increases along the flow direction with decreasing temperature. Overall performance results illustrate that higher refrigerant mass flow rate and decreasing finned-tube diameter lead to improved heat-transfer rates but also increased pressure drops. Design optimization of gas coolers should take into consideration their impact on overall refrigeration performance and life cycle cost. This is important in the drive to reduce the footprint of components, energy consumption, and environmental impacts of refrigeration and heat-pump systems. The present work provides practical guidance to the design of finned-tube gas coolers and can be used as the basis for the modelling of integrated sCO₂ refrigeration and heat-pump systems. Full article

(This article belongs to the Special Issue Selected Papers from the 16th UK Heat Transfer Conference (UKHTC2019))

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13 pages, 3617 KiB

Open AccessArticle

Simplified Layer Model for Solid Particle Clusters in Product Oil Pipelines

by Dongze Li, Lei Chen, Qing Miao, Gang Liu, Shuyi Ren and Zhiquan Wang

Energies 2019, 12(24), 4809; https://doi.org/10.3390/en12244809 - 17 Dec 2019

Cited by 5 | Viewed by 2477

Abstract

Pipe corrosion caused by the pressure tests using water before starting the normal operation occurs often in Chinese product oil pipelines because of remaining water. To explore the migration of the corrosion impurities in the product oil pipelines, this study started from the force balance principle and considered the entire particle cluster as the research object. This paper established a one-dimensional migration model, and proposed the Froude number equality criterion to calculate the particle cluster length in the equilibrium state. The proposed criterion was verified by experiments. A loop was built to conduct the tests and obtain the migration velocities of the particle cluster from the non-equilibrium state to the equilibrium state in the pipeline. The proposed model was verified using the experimental data. Verification results demonstrate that the model can describe the development process from the non-equilibrium state to the equilibrium state of particle clusters after sudden external disturbance and accurately predict some important parameters, including the velocity of the particle cluster in the equilibrium state and the critical velocity that leads to the transition from fixed bed flow to moving bed flow. The model provides the theoretical basis and calculation method to remove corrosion impurities from product oil pipelines. Full article

(This article belongs to the Special Issue Selected Papers from the 16th UK Heat Transfer Conference (UKHTC2019))

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12 pages, 3344 KiB

Open AccessArticle

Sand Transport and Deposition Behaviour in Subsea Pipelines for Flow Assurance

by Yan Yang, Haoping Peng and Chuang Wen

Energies 2019, 12(21), 4070; https://doi.org/10.3390/en12214070 - 25 Oct 2019

Cited by 16 | Viewed by 5257

Abstract

Sand transport through tubing and pipeline could cause a series of problems to flow assurance, if not properly managed or controlled. The most serious problem is the accumulation and erosion in multiphase flow pipelines and the surface equipment. Therefore, the importance of understanding the transport and deposition behaviour of sands through multiphase flow pipelines cannot be overemphasized. This study presents the sand transport and deposition characteristics in the complicated multiphase flow pipeline. The numerical result shows that the slurry velocity presents a uniform distribution in the multiphase flow pipeline at the sand concentration of 5% and the sand diameter of 50 µm. However, the slurry velocity at the bottom of the pipeline is significantly smaller than that at the top when the sand concentration and diameter reach 30% and 300 µm, respectively. It indicates that the sand deposition at the bottom of the pipe declines the slurry velocity and transport capacity. The deposition thickness is approximately 10% of the pipe diameter even at the low concentration of 5% sand with a small sand diameter of 50 µm and a high slurry velocity of 1.8 m/s. The sand deposition reaches about 30% of the pipe diameter at the same low concentration and high slurry velocity when the sand diameter increases to 300 μm. Full article

(This article belongs to the Special Issue Selected Papers from the 16th UK Heat Transfer Conference (UKHTC2019))

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Selected Papers from the 16th UK Heat Transfer Conference (UKHTC2019)

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