Special Issue "Heat Transfer Reinforcement Techniques in Heat Exchangers"

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

Deadline for manuscript submissions: 5 January 2023.

Special Issue Editor

Dr. Hijaz Ahmad
E-Mail Website
Guest Editor

Special Issue Information

Dear Colleagues,

Improving the thermal and dynamic performance of heat exchanger and solar collector channels is the goal of many numerical, analytical, and experimental studies in the field of renewable energies. Several methods have been followed for successful energy efficiency, such as restructuring the internal structure of the channel by adding extended surfaces or improving the thermal physical properties of the flow by creating new fluids, such as nanofluids. These energetic enhancement strategies are essential and have been the target of many recent studies. Several recent review studies have summarized various research related to promoting heat transfer and its applications with channels using baffle and fin-type obstacles. Various research studies have examined different types of turbulators, deflectors, and vortex generators for different flow conditions. On the other hand, nanofluids have witnessed significant development during the recent period by improving its structure, in addition to its multiple applications in various industrial fields. Many review analyses have dealt with the latest events of these fluids in terms of composition, as well as in terms of their use. In addition, the application of nanofluids has not only promoted heat transfer in the channels but was also used for other configurations, such as cavities and enclosures.

This Special Issue aims to seek and promote knowledge on the technology and science of heat-exchanger energy and its applications. Original research papers and reviews on the various topics of heat transfer systems and components are welcome. Papers of experimental aspect, numerical simulation and modeling are welcome. Topics of interest for the Special Issue include, but are not limited to, the following: models and applications of heat exchangers; heat transfer enhancement techniques (vortex generators, nanofluids, porous media, etc.); heat and mass transfer; fluid–solid interactions; modeling, simulation, optimization, experimentation, and characterization of heat exchangers.

Dr. Hijaz Ahmad
Guest Editor

Manuscript Submission Information

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Keywords

  • heat exchangers
  • heat transfer reinforcement
  • vortex generators
  • nanofluids
  • porous media
  • heat and mass transfer
  • fluid–solid interactions
  • modeling
  • simulation
  • experimentation
  • optimization

Published Papers (4 papers)

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Research

Article
Analysis of Heat and Mass Transfer Features of Hybrid Casson Nanofluid Flow with the Magnetic Dipole Past a Stretched Cylinder
Appl. Sci. 2021, 11(23), 11203; https://doi.org/10.3390/app112311203 - 25 Nov 2021
Viewed by 188
Abstract
The main purpose of this research is to scrutinize the heat and mass transfer in the Casson hybrid nanofluid flow over an extending cylinder in the presence of a magnetic dipole and double stratification. The nanofluid contained chemically reactive hybrid nanoparticles (Ag, MgO) [...] Read more.
The main purpose of this research is to scrutinize the heat and mass transfer in the Casson hybrid nanofluid flow over an extending cylinder in the presence of a magnetic dipole and double stratification. The nanofluid contained chemically reactive hybrid nanoparticles (Ag, MgO) in the conventional fluids (water). The effects of viscous dissipation, radiation, and concentration stratification were taken into consideration. In the presence of gyrotactic microorganisms and the Non-Ficks Model, the flow was induced. Incorporating microorganisms into a hybrid nanofluid flow is thought to help stabilize the dispersed nanoparticles. For viscosity and thermal conductivity, experimental relations with related dependence on nanoparticle concentration were used. To acquire the nonlinear model from the boundary layer set of equations, suitable similarity transformations were employed. The built-in function bvp4c of Matlab software was utilized to solve the transformed equation numerically. The graphical results were obtained for temperature, velocity, concentration, and microorganism distribution for various parameters. The numerical amounts of drag friction, heat transport rate, and motile density number for different parameters are presented through tables. It is seen that the fluid velocity is augmented by the increase of the curvature parameter, while a decrease occurs in the fluid velocity with an increase in the magnetic and slips parameters. The comparison of the present study with previously available studies is discussed, which shows a good agreement with published results. Full article
(This article belongs to the Special Issue Heat Transfer Reinforcement Techniques in Heat Exchangers)
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Article
Numerical Investigation of Heat Transfer on Unsteady Hiemenz Cu-Water and Ag-Water Nanofluid Flow over a Porous Wedge Due to Solar Radiation
Appl. Sci. 2021, 11(22), 10855; https://doi.org/10.3390/app112210855 - 17 Nov 2021
Viewed by 206
Abstract
Nanoparticles are generally used to scatter and absorb solar radiations in nanofluid-based direct solar receivers to efficiently transport and store the heat. However, solar energy absorption in nanofluid can be enhanced by using differential materials and tuning nanofluid parameter. In this regard, theoretical [...] Read more.
Nanoparticles are generally used to scatter and absorb solar radiations in nanofluid-based direct solar receivers to efficiently transport and store the heat. However, solar energy absorption in nanofluid can be enhanced by using differential materials and tuning nanofluid parameter. In this regard, theoretical investigations of unsteady homogeneous Hiemenz flow of an incompressible nanofluid having copper and silver nanoparticles over a porous wedge is carried out by using optimal homotopy asymptotic method (OHAM). Hence, a semi-analytical solver is applied to the transformed system to study the significance of magnetic field along with Prandtl number. In this work, impacts of conductive radiations, heat sink/source, unsteadiness, and flow parameters have been investigated for velocity and temperature profiles of copper and silver nanoparticles-based nanofluid. The effects of magnetic strength, volume fraction of nanoparticles, thermal conductivity, and flow parameters have also been studied on the considered nanofluids. Full article
(This article belongs to the Special Issue Heat Transfer Reinforcement Techniques in Heat Exchangers)
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Article
Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity
Appl. Sci. 2021, 11(21), 9924; https://doi.org/10.3390/app11219924 - 23 Oct 2021
Viewed by 419
Abstract
The cooling effect of turbine vane is of great importance for ensuring thermal protection and economic operation of gas turbines. This study aims to reveal the influence mechanism and performance of impingement cooling and heat transfer within a turbine guide vane cavity. Then, [...] Read more.
The cooling effect of turbine vane is of great importance for ensuring thermal protection and economic operation of gas turbines. This study aims to reveal the influence mechanism and performance of impingement cooling and heat transfer within a turbine guide vane cavity. Then, a turbine guide vane cavity with a complex pin fins structure is numerically investigated at a multi-hole impingement by comparison with experiment verification. The results show that the larger the Reynolds number is, the larger the average Nusselt number is on the upper and lower surfaces of the cavity. The average Nusselt number increased on the upper and lower surfaces as the impingement hole diameter increased. Comparing 1 impingement hole with 16 ones, the average Nusselt number of the lower surface of the latter is 553.9% larger than that of the former. Furthermore, the average Nusselt number of the lower surface for pin fin height of 3 mm is only improved by 11.2% for pin fin height of 24 mm. The heat transfer effect near the impingement holes is better than that far away from the impingement holes. In particular, it is recommended to have 14 impingement holes with a hole diameter of 7.2 mm, as well as circular pin fins with a height of 3 mm and spacing of 25.8 mm. In addition, the entropy generation distribution in impingement cooling is analyzed. This study can provide a reference to enhance the turbine vane cooling performance by optimization design. Full article
(This article belongs to the Special Issue Heat Transfer Reinforcement Techniques in Heat Exchangers)
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Article
Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes
Appl. Sci. 2021, 11(20), 9477; https://doi.org/10.3390/app11209477 - 12 Oct 2021
Viewed by 383
Abstract
In this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow [...] Read more.
In this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow characteristics of a three-row staggered bank for Re (2600 ≤ Re ≤ 10,200). It has been observed that the thermal exchange rate and Colburn factor increase according to the axis ratio and the flatness, where O1 and F1 provide the highest values. O1 produces the lowest friction factor values of all the oval tubes at all Re, and F4 gives 13.2–18.5% less friction than the other tube forms. In terms of performance evaluation criterion, all of the tested tubes outperformed the conventional circular tube (O5), with O1 and F1 obtaining the highest values. The global performance criterion of O1 has been found to be 9.6–45.9% higher as compared to the other oval tube geometries at lower values of Re, and the global performance criterion increases with the increase in flatness. The F1 tube shape outperforms all the examined tube designs; thus, this tube geometry suggests that it be used in energy systems. Full article
(This article belongs to the Special Issue Heat Transfer Reinforcement Techniques in Heat Exchangers)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Dear Colleagues,

Improving the thermal and dynamic performance of heat exchanger and solar collector channels is the goal of many numerical, analytical, and experimental studies in the field of renewable energies. Several methods have been followed for successful energy efficiency, such as restructuring the internal structure of the channel by adding extended surfaces or improving the thermal physical properties of the flow by creating new fluids, such as nanofluids. These energetic enhancement strategies are essential and have been the target of many recent studies. Several recent review studies have summarized various research related to promoting heat transfer and its applications with channels using baffle and fin-type obstacles. Various research studies have examined different types of turbulators, deflectors, and vortex generators for different flow conditions. On the other hand, nanofluids have witnessed significant development during the recent period by improving its structure, in addition to its multiple applications in various industrial fields. Many review analyses have dealt with the latest events of these fluids in terms of composition, as well as in terms of their use. In addition, the application of nanofluids has not only promoted heat transfer in the channels but was also used for other configurations, such as cavities and enclosures.

This Special Issue aims to seek and promote knowledge on the technology and science of heat-exchanger energy and its applications. Original research papers and reviews on the various topics of heat transfer systems and components are welcome. Papers of experimental aspect, numerical simulation and modeling are welcome. Topics of interest for the Special Issue include, but are not limited to, the following: models and applications of heat exchangers; heat transfer enhancement techniques (vortex generators, nanofluids, porous media, etc.); heat and mass transfer; fluid–solid interactions; modeling, simulation, optimization, experimentation, and characterization of heat exchangers.

Dr. Hijaz Ahmad
Guest Editor

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