Effect of curved segmental baffle on a shell and tube heat exchanger thermohydraulic performance: Numerical investigation

El‐Said, Emad M.S.; Elsheikh, Ammar H.; El-Tahan, Hamed R.

doi:10.1016/j.ijthermalsci.2021.106922

Cited by 35 publications

(8 citation statements)

References 11 publications

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“…Solving the steady three-dimensional Reynolds-Averaged Navier-Stokes (RANS) equations coupled with a turbulence model by commercial software is a reliable method for a fluid problem. 35 In this study, ANSYS CFX is adopted for calculation. Before calculating, the combustor domain is discretized with structured multi-block meshes by ICEM CFD shown in Figure 4.…”

Section: Combustor Domainmentioning

confidence: 99%

Turbine vane endwall aerothermal and film cooling performance considering realistic swirling inflow conditions

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The turbine vane inlet downstream of the lean premixed combustor presents nonuniform distributions of velocity and temperature. For obtaining swirling inflow profiles close to reality, the simulated non-reacting combustor is designed firstly. Applying these profiles as inflow boundary conditions, the effects of realistic swirling inflow on the turbine vane endwall aerothermal characteristics and film cooling performance are numerically investigated through solving the three-dimensional Reynolds-Averaged Navier-Stokes equations coupled with the shear stress transfer ([Formula: see text]) turbulence model. Two swirling orientations (anticlockwise and clockwise) and five swirling core pitch-wise positions (aligned with vane 1 to vane 2) are considered in the current work. The results indicate that the residual vortices in the vane passage are strengthened and move with the swirling core along the pitch-wise direction. The migration of the horseshoe vortex is controlled by this movement. The shrinkage or expansion of the separation line of the horseshoe vortex can be observed under the anticlockwise and clockwise swirling inflow conditions respectively. The anticlockwise swirling inflow results in a larger aerodynamic loss by a 10%–35% increase of the laterally [Formula: see text]. The high Nu region near the pressure side surface enlarges and the area-averaged Nu at [Formula: see text] increases from 2337.9 to 2878.3. For the cases with clockwise swirling inflow, the area of the hot ring is enlarged and the Nu downstream of the row 3 film holes is decreased. As for the film cooling performance, the endwall coverage area shrinks and the phantom cooling area enlarges when the anticlockwise swirling core is aligned with vane 2. The endwall loses the protection from the row 3 film holes and the cooling failure ([Formula: see text]) occurs at [Formula: see text] when the swirling core is aligned with the vane passage. This is an extremely bad phenomenon that should be avoided. Among all cases, the highest endwall area-averaged [Formula: see text] (0.122) is obtained when the clockwise swirling core is aligned with vane 1. The largest endwall coverage area is achieved when the clockwise swirling core is aligned with vane 2.

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Section: Combustor Domainmentioning

confidence: 99%

Turbine vane endwall aerothermal and film cooling performance considering realistic swirling inflow conditions

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…To increase the inner water temperature and heat transfer capacity of water, a heat exchange medium is used, which preheats the water; hence, the efficiency of a solar still could be improved. In a heat exchanger, the liquid is separately passed into a tube where heat is exchanged between two fluids, and a thermal effect is achieved [52].…”

Section: Heat Exchangermentioning

confidence: 99%

Applications of Heat Exchanger in Solar Desalination: Current Issues and Future Challenges

Elsheikh

Panchal²,

Shanmugan

et al. 2022

Water

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Solar desalination is a process to convert saline water into potable water by the application of solar energy. The enhancement of the distillate output of the solar desalination is low, so it is not considered as a method to produce potable water. A heat exchanger is an important device used for heat transfer applications. The present review article illustrates the application of a heat exchanger with a solar desalination system to enhance the distillate output. In the current review, it is found that the heat exchanger is an important device to improve the distillate productivity of the solar desalination system. Finally, the future work and future challenges of using a heat exchanger with a solar desalination system are presented.

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“…The passive technique (Mousavi Ajarostaghi et al, 2022) provides an increase in the heat transfer by making structural changes such as addition of the extra equipment and using different heat transfer fluids. Researchers have generally focused on lots of ways such as twisted tapes (Gürsoy et al, 2022a(Gürsoy et al, , 2022b, baffles (El-Said et al, 2021), winglets (Promvonge et al, 2021), extended surfaces (Zaboli et al, 2021), porous materials (Chakravarty et al, 2021), coil inserts (Dinh et al, 2022), rough surfaces (Gürsoy et al, 2023), mono, hybrid and ternary nanofluids (Dezfulizadeh et al, 2022;Said et al, 2022;Sirine et al, 2022). For instance, rough surface, which includes dimpled fins (DFs), is one of the prominent passive techniques in the geometric improvement, and this phenomenon has been investigated by numerous researchers in the literature (Gürdal et al, 2022a(Gürdal et al, , 2022b(Gürdal et al, , 2022cSuri et al, 2022; Magnetoconvection characteristics Malapur et al, 2023) conducted a computational analyse on five different dimpled tubes (DT).…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have generally focused on lots of ways such as twisted tapes (Gürsoy et al. , 2022a, 2022b), baffles (El-Said et al. , 2021), winglets (Promvonge et al.…”

Section: Introductionmentioning

confidence: 99%

Investigation of magneto-convection characteristics in a sudden expanding channel with convex surface geometry under thermally developing flow conditions

Gürsoy,

Pazarlioğlu,

Gürdal

et al. 2024

HFF

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Purpose The purpose of this study is to analyse the magnetic field effect on Fe3O4/H2O Ferrofluid flowing in a sudden expansion tube, which has specific behaviour in terms of rheology, with convex dimple fins. Because the investigation of flow separation is a prominent application in performance, the effect of magnetic field and convex dimple on the thermo-hydraulic performance of sudden expansion tube are examined, in detail. Design/methodology/approach During the solution of the boundary conditions of the sudden expansion tube, finite volume method was used. Analyses have been conducted considering the single-phase solution, steady-state, incompressible fluid and no-slip condition of the wall under forced convection conditions. In the analyses, it has been assumed that the flow was developing thermally and has been fully developed hydrodynamically. Findings The present study focuses on exploring the influence of the magnetic field, nanofluid concentration and convex dimple fins on the thermo-hydraulic performance of sudden expansion tube. The results indicate that the strength of the magnetic field, nanofluid concentration and convex dimple fins have a positive effect on the convective heat transfer in the system. Originality/value The authors conducted numerical studies, determining through a literature search that no one had yet investigated enhancing heat transfer on a sudden expansion tube using combinations of magnetic fields, nanofluids and convex dimple fins. The results of the numerical analyses provide valuable information about the improvement of heat transfer and system performance in electronic device cooling and heat exchangers.

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Effect of curved segmental baffle on a shell and tube heat exchanger thermohydraulic performance: Numerical investigation

Cited by 35 publications

References 11 publications

Turbine vane endwall aerothermal and film cooling performance considering realistic swirling inflow conditions

Turbine vane endwall aerothermal and film cooling performance considering realistic swirling inflow conditions

Applications of Heat Exchanger in Solar Desalination: Current Issues and Future Challenges

Investigation of magneto-convection characteristics in a sudden expanding channel with convex surface geometry under thermally developing flow conditions

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