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1. Femtosecond laser micromachining of diamond: Current research status, applications and challenges

Author:
Ali, Bakhtiar; Litvinyuk, Igor V.; Rybachuk, Maksym
Source:
Carbon 2021 v.179 pp. 209-226
ISSN:
0008-6223
Subject:
heat transfer,   etc   ; energy; irradiation;     Show all 3 Subjects
Abstract:
... Ultra-fast femtosecond (fs) lasers provide a unique technological opportunity to precisely and efficiently micromachine materials with minimal thermal damage owing to the reduced heat transfer into the bulk of the work material offered by short pulse duration, high laser intensity and focused optical energy delivered on a timescale shorter than the rate of thermal diffusion into the surrounding ar ...
DOI:
10.1016/j.carbon.2021.04.025

2. A simple method to predict transient diffusion processes in ellipsoids

Author:
Purlis, Emmanuel; Goñi, Sandro M.
Source:
Biosystems engineering 2021 v.205 pp. 27-47
ISSN:
1537-5110
Subject:
heat transfer,   etc   ; cooling; rehydration;     Show all 3 Subjects
Abstract:
... This work is focused on transient diffusion processes inside semi-solid and solid agri-food products presenting ellipsoidal shape, i.e. prolate and oblate spheroids and general ellipsoid. Many typical industrial operations like drying, soaking, rehydration, heating, cooking, and cooling, can be effectively modelled by using Fick's law for mass diffusion and Fourier's law for heat conduction, with ...
DOI:
10.1016/j.biosystemseng.2021.02.011

3. Constraining the heat transfer coefficient of rock fractures

Author:
Heinze, Thomas
Source:
Renewable energy 2021 v.177 pp. 433-447
ISSN:
0960-1481
Subject:
heat transfer; heat transfer coefficient,   etc   ; prognosis; renewable energy sources; temperature;     Show all 5 Subjects
Abstract:
... Estimating the heat transfer in deep underground geothermal systems is a challenging task. The concept of explicitly describing the heat transfer between phases has been shown superior to the conventional approach but the heat transfer coefficient of fractures is still ambiguous. In this work, a definition of the lower and upper bound of the heat transfer coefficient between rock and flowing fluid ...
DOI:
10.1016/j.renene.2021.05.089

4. Nanofluid Boiling on Micro/Nano-engineered Surfaces

Author:
Ridwan, Shakerur; Pollack, Jordan; McCarthy, Matthew
Source:
Langmuir 2021 v.37 no.20 pp. 6107-6114
ISSN:
1520-5827
Subject:
heat transfer; heat transfer coefficient,   etc   ; insulating materials; nanofluids; particle size;     Show all 5 Subjects
Abstract:
... This work characterizes the impact of boiling aqueous nanofluids on engineered surfaces designed for boiling enhancement with pure water. Although micro/nano-engineered surfaces have been shown to enhance boiling, these achievements are typically demonstrated using deionized water or other purified fluids. In parallel, particulate-laden fluids, also known as nanofluids, have been shown to enhance ...
DOI:
10.1021/acs.langmuir.0c02896

5. Microtube Surfaces for the Simultaneous Enhancement of Efficiency and Critical Heat Flux during Pool Boiling

Author:
Song, Youngsup; Gong, Shuai; Vaartstra, Geoffrey; Wang, Evelyn N.
Source:
ACS applied materials & interfaces 2021 v.13 no.10 pp. 12629-12635
ISSN:
1944-8252
Subject:
heat transfer; heat transfer coefficient,   etc   ; evaporation; steam; water purification; wettability;     Show all 6 Subjects
Abstract:
... Boiling is an essential process in numerous applications including power plants, thermal management, water purification, and steam generation. Previous studies have shown that surfaces with microcavities or biphilic wettability can enhance the efficiency of boiling heat transfer, that is, the heat transfer coefficient (HTC). Surfaces with permeable structures such as micropillar arrays, in contras ...
DOI:
10.1021/acsami.1c00750

6. Latest progress on nanotechnology aided boiling heat transfer enhancement: A review

Author:
Chen, Jingtan; Ahmad, Shakeel; Cai, Junjie; Liu, Huaqiang; Lau, Kwun Ting; Zhao, Jiyun
Source:
Energy 2021 v.215 pp. 119114
ISSN:
0360-5442
Subject:
heat transfer; heat transfer coefficient,   etc   ; energy conversion; hydrophilicity; hydrophobicity; nanofluids;     Show all 6 Subjects
Abstract:
... Boiling heat transfer has drawn continuous attention owing to its wide range of applications in the energy fields. In the boiling process, the heat transfer coefficient (HTC) enhancement is needed for better energy conversion efficiency, and the critical heat flux (CHF) enhancement is needed to avoid boiling crises. With the advancement of nanotechnology, nanoscale surface modifications and nanofl ...
DOI:
10.1016/j.energy.2020.119114

7. Thermohydraulic model of Smart Thermal Grids with bidirectional power flow between prosumers

Author:
Licklederer, Thomas; Hamacher, Thomas; Kramer, Michael; Perić, Vedran S.
Source:
Energy 2021 v.230 pp. 120825
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; computer software; energy;     Show all 3 Subjects
Abstract:
... Part of Smart Energy Systems are Smart Thermal Grids, which enable bidirectional power flow between prosumers. To facilitate this feature, the network architecture and intelligent control of the decentralized actuators are a major challenge. Therefore, methods for the analysis of prosumer-dominated thermal networks are needed, including the hydraulic actuators and the heat transfer to the prosumer ...
DOI:
10.1016/j.energy.2021.120825

8. A design method for optimizing the secondary reflector of a parabolic trough solar concentrator to achieve uniform heat flux distribution

Author:
Tang, X.Y.; Yang, W.W.; Yang, Y.; Jiao, Y.H.; Zhang, T.
Source:
Energy 2021 v.229 pp. 120749
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; energy; solar collectors;     Show all 3 Subjects
Abstract:
... Non-uniform solar flux distribution in a parabolic trough concentrator (PTC) causes large temperature gradients on absorber tube surface, making the PTC inefficient and damaged. To solve the problem, a novel method is proposed for designing the additional secondary reflector (SR) in a PTC to improve uniform heat flux distribution on absorber tube surface. In the design, the heat flux between upper ...
DOI:
10.1016/j.energy.2021.120749

9. Optimizing thermal performance and exergy efficiency in hydrogen-fueled meso-combustors by applying a bluff-body

Author:
Cai, Tao; Zhao, Dan; Karimi, Nader
Source:
Journal of cleaner production 2021 v.311 pp. 127573
ISSN:
0959-6526
Subject:
heat transfer,   etc   ; exergy; geometry; temperature;     Show all 4 Subjects
Abstract:
... Recognizing the importance of a bluff-body on the flow separation and its role in enhancing the fuel mixing, the effect of applying a bluff-body on the thermal performance and exergy efficiency in hydrogen-fueled meso-scale combustors are discussed using 3D numerical simulations involving a detailed kinetics mechanism. Key parameters including the bluff-body dimensionless axial location l and comb ...
DOI:
10.1016/j.jclepro.2021.127573

10. State-of-the-art review of nanofluids in solar collectors: A review based on the type of the dispersed nanoparticles

Author:
Xiong, Qingang; Hajjar, Ahmad; Alshuraiaan, Bader; Izadi, Mohsen; Altnji, Sam; Shehzad, Sabir Ali
Source:
Journal of cleaner production 2021 v.310 pp. 127528
ISSN:
0959-6526
Subject:
heat transfer,   etc   ; nanofluids; thermal properties;     Show all 3 Subjects
Abstract:
... Nanofluids as a new generation of fluids have attracted a lot of research works. There is growing evidence that the nanofluids are more suitable for various heat transfer applications than the conventional fluids. One of the most important parameters in the thermal behavior of such fluids is the type of nanoparticles dispersed in the base fluid. The present review paper is devoted to provide an ov ...
DOI:
10.1016/j.jclepro.2021.127528

11. Enhancing heat transfer performance analyses of a hydrogen-fueled meso-combustor with staggered bluff-bodies

Author:
Cai, Tao; Sun, Yuze; Zhao, Dan
Source:
Fuel processing technology 2021 v.218 pp. 106867
ISSN:
0378-3820
Subject:
heat transfer,   etc   ; energy conversion; temperature;     Show all 3 Subjects
Abstract:
... To improve the energy conversion efficiency of a thermo-photo-voltaic system, there is a need to optimize the combustor performance. This work considers applying staggered bluff-bodies to enhance thermal performance in a hydrogen-fueled meso-combustor. Effects of the equivalence ratio ϕ, the staggered bluff-bodies dimensionless height h, and the pitch ratio PR are numerically assessed and analyzed ...
DOI:
10.1016/j.fuproc.2021.106867

12. Pilot-Scale Experimental Investigation of Multifield Coupling and Heterogeneity during Hydrate Dissociation

Author:
Wan, Kun; Li, Xiao-Sen; Wang, Yi; Li, Xiao-Yan; Kou, Xuan; Hu, Heng-Qi; Zhang, Yu
Source:
Energy & fuels 2021 v.35 no.9 pp. 7967-7980
ISSN:
1520-5029
Subject:
heat transfer,   etc   ; dissociation; potential energy;     Show all 3 Subjects
Abstract:
... Natural gas hydrates are considered as a potential energy resource for the future. In this study, for the first time, the pilot-scale hydrate simulator (PHS), with an effective volume of 117.8 L, was applied to investigate the multifield coupling (decomposition-heat transfer-flow) and heterogeneity during hydrate dissociation using the newly added flow-field measurement system. The experimental me ...
DOI:
10.1021/acs.energyfuels.1c00711

13. Hydrodynamics characteristics and particle distribution in a liquid–solid circulating fluidized bed boiler

Author:
Jiang, Feng; Shen, Yu; Qi, Guopeng; Jing, Wenyue; Li, Xiao; Yare, Salah; Li, Xiulun
Source:
Powder technology 2021 v.377 pp. 41-54
ISSN:
0032-5910
Subject:
heat transfer,   etc   ; fluidized beds; hydrodynamics;     Show all 3 Subjects
Abstract:
... A circulating fluidized bed boiler is designed and built to conduct visualization study by combining the circulating fluidized bed heat transfer technology and boiler. Water and polyformaldehyde particles are selected as the working media. The effect of the operating parameters such as the amount of added particles and feedwater flow rate on the fluidization and distribution of particles are inves ...
DOI:
10.1016/j.powtec.2020.08.076

14. Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy

Author:
Barbano, Francesco; Brattich, Erika; Di Sabatino, Silvana
Source:
Boundary-layer meteorology 2021 v.178 no.1 pp. 119-142
ISSN:
0006-8314
Subject:
heat transfer,   etc   ; canopy; meteorology; momentum;     Show all 4 Subjects
Abstract:
... An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time sc ...
DOI:
10.1007/s10546-020-00554-5

15. A two-step procedure for the selection of innovative high temperature heat transfer fluids in solar tower power plants

Author:
Manzolini, Giampaolo; Lucca, Gaia; Binotti, Marco; Lozza, Giovanni
Source:
Renewable energy 2021 v.177 pp. 807-822
ISSN:
0960-1481
Subject:
heat transfer,   etc   ; electricity; liquids; temperature; thermal energy;     Show all 5 Subjects
Abstract:
... This work compares with a two-step procedure the performance of different Heat Transfer Fluids (HTF) for high temperature receiver applications (up to 715 °C) in advanced Solar Tower (ST) plants. The most promising molten salts and liquid metals are initially selected and ranked according to their performance, estimated with different Figures of Merit (FoM) available in literature or newly defined ...
DOI:
10.1016/j.renene.2021.05.153

16. Effects of design parameters on fatigue–creep damage of tubular supercritical carbon dioxide power tower receivers

Author:
Chen, Yuxuan; Zhang, Yanping; Wang, Ding; Hu, Song; Huang, Xiaohong
Source:
Renewable energy 2021 v.176 pp. 520-532
ISSN:
0960-1481
Subject:
heat transfer,   etc   ; carbon dioxide; solar collectors; temperature;     Show all 4 Subjects
Abstract:
... This study proposes a method for calculating the fatigue–creep of a supercritical carbon dioxide (sCO₂) solar receiver based on the linear damage accumulation (LDA) theory. The effects of temperature and stress on creep and fatigue were considered through the Manson–Coffin formula and Mendelson–Roberts–Manson (M–R–M) correlation, and the interaction between creep and fatigue was reflected by adopt ...
DOI:
10.1016/j.renene.2021.05.069

17. Analysis of the unsteady thermal response of a Li-ion battery pack to dynamic loads

Author:
Saeed, Ali; Karimi, Nader; Paul, Manosh C.
Source:
Energy 2021 v.231 pp. 120947
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; cooling; energy; lithium batteries; temperature;     Show all 5 Subjects
Abstract:
... It is becoming increasingly apparent that wide application of electric vehicles (EVs) are subject to significant improvements in battery technology. Temperature sensitivity is a major issue adversely affecting battery performance and requiring a robust thermal control. Yet, this is challenged by the large variety of temporal scenarios though which heat is generated in a battery pack, demanding dyn ...
DOI:
10.1016/j.energy.2021.120947

18. Cycle cut-off criterion effect on the performance of cascaded, sensible, combined sensible-latent heat storage tank for concentrating solar power plants

Author:
Elfeky, Karem Elsayed; Mohammed, Abubakar Gambo; Wang, Qiuwang
Source:
Energy 2021 v.230 pp. 120771
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; models; solar energy; thermal energy;     Show all 4 Subjects
Abstract:
... Thermocline thermal energy storage (TES) technology that uses the molten salt as heat transfer fluid is cheaper than a traditional two-tank structure, owing to its composite design and use of inexpensive filler materials. Nevertheless, this TES type suffers from the significant disadvantage of low capacity and utilization ratio when it is integrated with concentrating solar power plants due to mod ...
DOI:
10.1016/j.energy.2021.120771

19. Development of internal heat transfer correlations for the cylinders of reciprocating machines

Author:
Rutczyk, Bartlomiej; Szczygieł, Ireneusz
Source:
Energy 2021 v.230 pp. 120795
ISSN:
0360-5442
Subject:
heat transfer coefficient,   etc   ; combustion; convection; energy;     Show all 4 Subjects
Abstract:
... The paper presents a review of heat transfer correlations available for cylinder-piston, reciprocating machinery. For the purpose of this work, this includes correlations, either dimensional or non-dimensional, describing the convective heat transfer coefficient on the cylinder wall surface. This is in most cases a function of gas parameters inside the cylinder, gas composition, piston velocity an ...
DOI:
10.1016/j.energy.2021.120795

20. The effect of heat flux distribution and internal heat generation on the thermal damage in multilayer tissue in thermotherapy

Author:
Malekmohamadi, Mohamad Hasan; Ahmadikia, Hossein; Mosharaf-Dehkordi, Mehdi
Source:
Journal of thermal biology 2021 v.99 pp. 102920
ISSN:
0306-4565
Subject:
heat transfer,   etc   ; Biological Sciences; neoplasms; temperature; thermotherapy;     Show all 5 Subjects
Abstract:
... Proper analysis of the temperature distribution during heat therapy in the target tissue and around it will prevent damage to other adjacent healthy cells. In this study, the exact solution of steady and unsteady of the hyperbolic bioheat equations is performed for multilayer skin with tumor at different heat fluxes on its surface and the generation of internal heat in the tumor. By determining th ...
DOI:
10.1016/j.jtherbio.2021.102920