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Heat Exchangers: Latest Advances and Prospects

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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Thermal Engineering".

Deadline for manuscript submissions: closed (1 June 2022) | Viewed by 14431

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Special Issue Editors

Dr. Huizhu Yang

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Guest Editor

School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China
Interests: electronic chip cooling; power battery thermal management technology; heat pipe technology; heat and mass transfer enhancement in porous metal; high efficiency heat exchangers
Special Issues, Collections and Topics in MDPI journals

Dr. Binjian Ma

E-Mail Website
Guest Editor

School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China
Interests: multiphase flow and heat transfer; phase change heat transfer; thermal management; thermal energy storage; nanofluid
Special Issues, Collections and Topics in MDPI journals

Dr. Yu Feng

E-Mail Website
Guest Editor

School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China
Interests: active thermal protection; supercritucal fluid; plate heat exchanger

Special Issue Information

Dear Colleagues,

Heat exchangers are easily one of the most important and widely used pieces of process equipment found in industrial sites. Over the past few decades, energy-saving and eco-friendly technological advancements have led to a need for technological innovation in heat exchangers in a diverse range of fields, such as chemical/petrochemical processing, food industry, HVAC, power generation, automotives, and electronic cooling. New techniques to improve heat transfer have recently appeared in engineering research, including the insertion of enhanced heat transfer structures (e.g., micro/nano-engineered surface, swirl-flow devices, and manifold microchannel heat sink), the improvement of thermophysical properties of working fluid (e.g., nanofluids, liquid metal and ferrofluid), and advanced design (e.g., digital twin, machine learning) or manufacturing techniques (e.g., e-beam additive manufacturing).

The objective of this Special Issue is to provide a top-notch platform for world-renowned researchers in the area of advanced heat exchangers to showcase their recent research advances and highlight possible future directions. Original research or review articles on the most recent analytical, numerical, and experimental research in this field are welcome to this Special Issue. Proposed subtopics of this Special Issue include but are not limited to the following:

Heat exchangers
Heat transfer enhancement techniques
Microchannel
Porous media
Liquid metal
Phase-change technology
Thermal management technology
Heat pipe

Dr. Huizhu Yang
Dr. Binjian Ma
Dr. Yu Feng
Guest Editors

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Keywords

microchannel
thermal management technology
heat pipe

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Published Papers (5 papers)

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Research

12 pages, 1917 KiB

Open AccessArticle

Overall Heat Transfer Coefficient Evaluation Method for Uncracked Hydrocarbon Fuel in a Regeneratively-Cooled Heat Exchanger of a Scramjet

by Haowei Li, Guowei Lin, Qing Xu, Xiaojia Fang and Shengxian Xian

Appl. Sci. 2022, 12(13), 6590; https://doi.org/10.3390/app12136590 - 29 Jun 2022

Cited by 2 | Viewed by 1693

Abstract

Regenerative cooling is critical for the thermal protection of hypersonic propulsion systems, wherein the flow and heat transfer characteristics of the hydrocarbon fuel in the cooling channel are crucial. Restricted by measurement, the distribution of the fuel temperature inside the cooling channel cannot be directly detected. As a result, the measurement of the convective heat transfer coefficient is more an overall heat transfer coefficient. Furthermore, the existing overall heat transfer coefficient calculation method is derived without considering the flow state of the hydrocarbon fuel in the cooling channel, which should be taken into consideration. Therefore, a modified calculation method of the overall heat transfer coefficient is proposed in this study. The results of the characteristics of the turbulence-related parameters show that the overall heat transfer coefficient is mainly determined by the effective thermal conductivity and surface convective heat transfer coefficient, which are related to the fuel temperature and flow state. Furthermore, the existing method might overestimate the overall heat transfer coefficient. The modified method is suitable for the calculation of the overall heat transfer coefficient in the heat transfer enhancement process in a cooling channel. Full article

(This article belongs to the Special Issue Heat Exchangers: Latest Advances and Prospects)

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14 pages, 5880 KiB

Open AccessArticle

Numerical Analysis of Tube Heat Exchanger with Trimmed Star-Shaped Fins

by Mladen Bošnjaković and Simon Muhič

Appl. Sci. 2022, 12(10), 4857; https://doi.org/10.3390/app12104857 - 11 May 2022

Cited by 6 | Viewed by 1819

Abstract

In some engineering applications, it is very desirable that the heat exchanger is as light as possible while maintaining the heat transfer rate at an acceptable level. In this context, the possibility of reducing the weight of the heat exchanger with the star-shaped fins by cutting off the thermally least efficient part of the fin was investigated. For this purpose, the rear part of the fins was trimmed to Ø28, Ø31 and Ø34 mm. Numerical analysis was used to determine the influence of each variant on the flow characteristics in the air–water heat exchanger and on heat transfer for the range of 2300 < Re < 16,000. The best results were obtained by trimming the rear part of the fin to Ø28 mm. With a 5.53% reduction in fin weight, heat transfer can be increased by up to 8.12% compared to the star-shaped fins without trimming. The pressure drop can be reduced by up to 0.92%. The trimmed fins were also compared with perforated star-shaped fins (perforation Ø2). At approximately the same weight, the trimmed fins increase the heat transfer coefficient by up to 5.75% with a reduction in pressure drop of up to 0.76% compared to the perforated fins. Full article

(This article belongs to the Special Issue Heat Exchangers: Latest Advances and Prospects)

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15 pages, 3404 KiB

Open AccessArticle

Comparison of the Axial Fan and Synthetic Jet Cooling Systems

by Emil Smyk, Paweł Gil, Rafał Gałek and Łukasz Przeszłowski

Appl. Sci. 2022, 12(9), 4349; https://doi.org/10.3390/app12094349 - 25 Apr 2022

Cited by 6 | Viewed by 1693

Abstract

Choosing the right cooling device is crucial for the proper operation of electronic equipment. A comparison of the two different cooling devices is presented in this paper: one with a standard axial fan and the other with a synthetic jet actuator. Two distinct sets of operating conditions of the fan and two different loudspeakers for the synthetic jet actuator were used. The experimental setup consisted of a radial heat sink mounted onto a round electric heater and two cooling systems: one with the axial fan and the other with a synthetic jet actuator. From the thermal balance in the specified control volume, the heat sink’s thermal resistance. as well as the coefficient of performance, were determined. The highest difference between the thermal resistance of both cooling systems occurred at a low input power of P = 0.5 W. The heat sink cooled with a synthetic jet had the thermal resistance of R = 0.39 K/W, while the same heat sink cooled with a fan achieved R = 0.23 K/W. Thus, the fan cooling exhibited almost 70% better performance than synthetic jet cooling. For a higher input power of P = 7.0 W, the relative difference in the thermal resistance decreased to the value of 42%. For the input power of P = 7.0 W, the fan-cooled heat sink dissipated the thermal power of

{\dot{Q}}_{HS} = 487 W

under the temperature difference between the heat sink base and ambient air equal to 60 K. For the same input power and temperature difference, the synthetic jet cooling of the same heat sink dissipated a thermal power of

{\dot{Q}}_{HS} = 339 W

. Under natural convection, the heat sink dissipated the thermal power of

{\dot{Q}}_{HS} = 57 W

. Thus, the heat transfer enhancement with fan cooling relative to natural convection was equal to 8.5, while the enhancement with synthetic jet cooling relative to natural convection was equal to 6.0. The modified coefficient of performance and the heat transfer rate of the heat sink per unit temperature difference and unit volume of the cooling device ε are presented. The axial fan performed better in terms of both parameters under consideration. The ε of the investigated device with a fan was around four times higher than in the case of the synthetic jet actuator and eight times higher than in the case of natural convection. Full article

(This article belongs to the Special Issue Heat Exchangers: Latest Advances and Prospects)

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16 pages, 15422 KiB

Open AccessArticle

Numerical Study on Flow and Heat Transfer of Supercritical Hydrocarbon Fuel in Curved Cooling Channel

by Ying Zhang, Yong Cao, Keyu Gong, Shuyuan Liu, Limin Wang and Zhengchun Chen

Appl. Sci. 2022, 12(5), 2356; https://doi.org/10.3390/app12052356 - 24 Feb 2022

Cited by 9 | Viewed by 2449

Abstract

The fluid flow and heat transfer of hydrocarbon fuel play a significant role in developing regenerative cooling technology for advanced aeroengines. Numerical simulations have been conducted to investigate the flow and heat transfer characteristics of China RP-3 aviation kerosene with pyrolysis in a 3D, 90° bend, square cooling channel around the cavity flame-holder of a scramjet. A chemical kinetic model, composed of 18 species and 24 reactions, was adopted to simulate the fuel pyrolysis process. Results indicate that the secondary flow enhances the mixing of the fluid, thus, the transports of heat and components are improved between the near-wall region and main flow field in the curved channel. Compared with a straight cooling channel, fuel conversion and heat-absorbing capacity are higher, and the heat transfer is effectively enhanced in a curved cooling channel. In addition, with the increasing inlet mass flow rate and the decreasing radius of curvature, the velocity of the secondary flow increases. The heat and components are easily transferred from the near-wall region to the main flow. The non-uniformities of fuel temperature and conversion at the cross section decreases, which is helpful for improving the utilization of the level of fuel heat-absorbing capacity, and beneficial for enhancing the heat transfer. Full article

(This article belongs to the Special Issue Heat Exchangers: Latest Advances and Prospects)

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16 pages, 4247 KiB

Open AccessArticle

Design Optimization of Plate-Fin Heat Exchanger in a Gas Turbine and Supercritical Carbon Dioxide Combined Cycle with Thermal Oil Loop

by Yue Cao, Jun Zhan, Jianxin Zhou and Fengqi Si

Appl. Sci. 2022, 12(1), 42; https://doi.org/10.3390/app12010042 - 21 Dec 2021

Cited by 5 | Viewed by 3324

Abstract

This paper presents an investigation on the optimum design for a plate-fin heat exchanger (PFHE) of a gas and supercritical carbon dioxide combined cycle which uses thermal oil as intermediate heat-transfer fluid. This may promote the heat transfer from low heat-flux exhaust to a high heat-flux supercritical carbon dioxide stream. The number of fin layers, plate width and geometrical parameters of fins on both sides of PFHE are selected as variables to be optimized by a non-dominated sorting genetic algorithm-II (NSGA-II), which is a multi-objective genetic algorithm. For the confliction of heat transfer area and pressure drop on the exhaust side, which are the objective indexes, the result of NSGA-II is a Pareto frontier. The technique for order of preference by similarity to ideal solution (TOPSIS) approach is applied to choose the optimum solution from the Pareto frontier. Finally, further simulation is performed to analyze the effect of each parameter to objective indexes and confirm the rationality of optimization results. Full article

(This article belongs to the Special Issue Heat Exchangers: Latest Advances and Prospects)

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