Flow felid and heat transfer enhancement investigations by using a combination of corrugated tubes with a twisted tape within 3D circular tube based on different dimple configurations

Al‐Obaidi, Ahmed Ramadhan; Alhamid, Jassim; Hamad, Faik

doi:10.1002/htj.22207

Cited by 18 publications

(11 citation statements)

References 26 publications

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“…In the simulations of the modified pipe, four different cases are studied, including the concavity (dimple) diameters of 1, 2, 3, and 4 mm with a corrugated diameter of 1 mm and twisted tape dimensions of 2 × 1 mm 2 , as illustrated in Figure 1. These modifications are studied in a wide range of Re numbers from 1000 to 15,000, and it is expected that a higher level of mixing and swirl flow are generated and hence, an improved heat transfer in the pipe is achieved 17,18 . The flow boundary conditions are solved and imposed for both smooth pipe and modified pipe.…”

Section: Description Of Physical Pipe Modelmentioning

confidence: 99%

“…These modifications are studied in a wide range of Re numbers from 1000 to 15,000, and it is expected that a higher level of mixing and swirl flow are generated and hence, an improved heat transfer in the pipe is achieved. 17,18 The flow boundary conditions are solved and imposed for both smooth pipe and modified pipe. The hydrodynamic boundary conditions velocity input and pressure output with non-slip conditions are considered, with inlet temperature 293 K corresponding to the inlet velocity.…”

Section: Description Of Physical Pipe Modelmentioning

confidence: 99%

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A numerical study to investigate the effect of turbulators on thermal flow and heat performance of a 3D pipe

2021

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To reduce the heat exchanger's costs in a highly competitive industry, thermal performance enhancement of the heat exchangers has successfully gained attention in the last few decades. Among different engineering approaches, the application of the enhanced pipes provides a key solution to improve heat performance. In this paper, the investigation develops a numerical study based on the commercially available computational fluid dynamics codes on the turbulent flow in three-dimensional tubular pipes. Various concavity (dimple) diameters with corrugation and twisted tape configurations are investigated. The study has shown that perforated geometrical parameters lead to a high fluid mixing and flow perturbation between the pipe core region and the walls, hence better thermal efficiency. Moreover, a model of concavity (dimple) with a 4 mm diameter allows the highest heat transfer enhancement among other designs. In addition, the study shows that due to the disturbance between the pipe core region and the pipe wall, the transverse vortices and swirl flow generated are forceful, which leads to better heat transfer enhancement compared with the conventional (smooth) pipes. As the Reynolds number (Re) rises, the mixing flow, secondary, and separation flow extend to become higher than the values in a smooth pipe, allowing a higher value of performance evaluation factor to be achieved for a dimple diameter of 1mm at the low Re values. This study, therefore, shows the promising potential of the enhanced pipes in the heat transfer enhancement of heat exchangers that is crucial in industrial applications to save more energy.

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Section: Description Of Physical Pipe Modelmentioning

confidence: 99%

Section: Description Of Physical Pipe Modelmentioning

confidence: 99%

A numerical study to investigate the effect of turbulators on thermal flow and heat performance of a 3D pipe

2021

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“…13,14 Using the computational fluid dynamics (CFD) method plays a significant role in different engineering fields because it can provide more quantitative and qualitative analyses results. [15][16][17] Different studies were carried out to analyze and optimize the flow in heat exchanger pipes such as the work done by Han et al 18 numerically simulated the optimization in the corrugated pipes of the double tubes. They used a test of the orthogonal scheme comprising four factors and three levels.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, investigating and optimizing the heat exchangers is a significant field to enhance and attempt to decreases the design cost 13,14 . Using the computational fluid dynamics (CFD) method plays a significant role in different engineering fields because it can provide more quantitative and qualitative analyses results 15–17 . Different studies were carried out to analyze and optimize the flow in heat exchanger pipes such as the work done by Han et al 18 numerically simulated the optimization in the corrugated pipes of the double tubes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of internal thermohydraulic flow and heat transfer improvement in a three‐dimensional circular corrugated tube surfaces based on numerical simulation and design of experiment

Al‐Obaidi

2022

Heat Trans

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To meet the requirements of development in heat exchangers design, the effect of different tubes geometrical parameters on its flow field analysis and thermal heat transfer performance are investigated in the current research work. The hydraulic thermal fluid coupling with computational simulations is applied. The numerical results are solving used flow transport and heat transfer equations, then these results are validated with available experimental data. The behavior of hydraulic and thermal flow in the corrugated tube is discussed with different geometrical parameters' position and shape. Turbulent flow in the tube is calculated in three‐dimensional numerical simulations with optimization of a multiobjective algorithm are analyzed. The influences of various design parameters, for instance, the number of corrugated rings around the tube, distance between each corrugated ring, the diameter of the ring, and pitch of ring are investigated firstly in the flow field and then optimized by using the design of experiment (DOE). The influence of flow structural modifications such as static pressure, dynamic pressure, and pressure drop is taken into consideration as analyzed performance parameters. The DOE method is investigated based on implements and variances the L16 orthogonal arrays are chosen as the experimental strategy. Furthermore, the optimization results found that the maximum value of pressure difference was for corrugated diameter. The numerical method using DOE has enhanced heat transfer rate as compared to the smooth pipe. Moreover, the minimum Tout is for Case 11 (296.49°C) and the maximum Tout is for (303.10°C) hence the value of Nu number for both cases is 32.9 and 42, respectively. That means using this type of passive device can improve the heat transfer in the pipe. The outcomes illustrate that the performance evaluation factor (PEF) ratio of the corrugated pipe with different geometrical configurations is changed and increased as the corrugated pipe geometrically changed and the value of PEF is more than 1.3.

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“…It is also possible to increase the heat exchange by changing the tube wall structure, increasing the energy dissipation in the tube, and reducing the reflected shock wave. For example, in the research of Al-Obaidi et al [17][18][19], different dimple geometrical configurations with a combination of corrugated tubes and twisted tape were numerically investigated. The study found that vortices and rotational flow originated behind and near the dimple, twisted tape, and corrugation surfaces.…”

Section: Introductionmentioning

confidence: 99%

Research on the Application Performance of the Helmholtz High-Efficiency Wave-Elimination Chamber in Gas Wave Tubes

et al. 2022

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A gas wave refrigerator is a device that uses gas pressure to expand and refrigerate; the moving shock wave in the gas wave tube is the key to cooling. If the shock wave is reflected to the open mouth of the gas wave tube, it will heat the expanded refrigeration gas at the open end, severely reducing the refrigeration efficiency. In order to reduce this effect, a Helmholtz middle wave chamber-type gas wave tube is presented here. This study describes the performance of this structure in the gas wave refrigeration process. The refrigeration performance of the structure’s gas wave tube use was evaluated experimentally and numerically using computational fluid dynamics (CFD). The function of the middle wave elimination chamber was studied and explained: the chamber turns the reflected shock wave back to the end section of the tube and converts part of the incoming shock wave to an expansion wave, which may counteract the reflected shock wave by escaping from wave elimination chamber. The experimental results showed that the structure increased refrigeration efficiency by about 2.9% (50 Hz), 2% (40 Hz), and 2.2% (25 Hz) at the corresponding ejection frequencies, and reduced the reflected shock wave intensity by 11%, which proves the high-efficiency energy dissipation performance and the significant increase in refrigeration efficiency of the Helmholtz-type gas wave tube.

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Flow felid and heat transfer enhancement investigations by using a combination of corrugated tubes with a twisted tape within 3D circular tube based on different dimple configurations

Cited by 18 publications

References 26 publications

A numerical study to investigate the effect of turbulators on thermal flow and heat performance of a 3D pipe

A numerical study to investigate the effect of turbulators on thermal flow and heat performance of a 3D pipe

Characterization of internal thermohydraulic flow and heat transfer improvement in a three‐dimensional circular corrugated tube surfaces based on numerical simulation and design of experiment

Research on the Application Performance of the Helmholtz High-Efficiency Wave-Elimination Chamber in Gas Wave Tubes

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