Numerical study of heat transfer enhancement using perforated dual twisted tape inserts in converging‐diverging tubes

Afsharpanah, Farhad; Pakzad, Khashayar; Amirsoleymani, Mehrshad; Delavar, Mojtaba Aghajani

doi:10.1002/htj.21340

Cited by 19 publications

(14 citation statements)

References 41 publications

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“…Heat exchangers are used in different areas such as HVAC, cars, petroleum and some other industries [34]. These devices are so important that a tremendous number of studies have been done in order to enhance them [35]. Different forms of heat exchangers can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

2019

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Nowadays electrical power is one of the most vital requirements for daily life and industries. Since with the rise of the human population, providing electrical energy is an important challenge, some methods should be used to reduce the electrical demand or shift the demand from peak-hours to off-peak hours. Ice storage systems are one of the devices which can be used for this purpose. In this article, a transient 3D numerical simulation was carried out to investigate the effects of two geometrical parameters of double helical coil heat exchanger in the charging process of an ice storage system with the volume of 15 L. These parameters were helical coil pitch length and the distance between inner and outer coils. The results indicated that with higher values for pitch length and inner and outer coils distance, compared to smallest values for these parameters, the distribution of formed ice in the storage improves and the rate of ice formation increases by 22.81% and 13.99%, respectively. Increasing these values can also retard the ice block formation which is an undesirable phenomenon in the external discharge process of the ice storage systems.

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Section: Introductionmentioning

confidence: 99%

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

2019

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“…Heat exchangers are used in a wide range of applications, including power plants, industries, and air conditioning systems. Tubular heat exchangers, such as double pipe, shell-and-tube, plate heat exchangers, which include the serpentine tube, gasketed plateand-frame, and plate-fin heat exchangers are some of these heat exchangers [19,20].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of solidification process in an ice-on-coil ice storage system with serpentine tubes

2019

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Energy consumption is rising around the world and most of the activities in the developed countries are dependent on electric energy. Thermal energy storages are one the ways to reduce energy consumption and balance the electrical power usage during the day. With thermal energy storages, or to be precise, with ice storage systems, energy usage peak can the shifted from the afternoon or early night to low-load hours of morning or midnights. In this study, a 3D unsteady numerical analysis was done in order to examine an ice storage system equipped with serpentine tube heat exchanger. The influence of two geometrical parameters, namely, tube diameter and serpentine tube row distance were investigated. The examined range for diameter and the serpentine tube row spacing were 15-21 and 30-100 mm, respectively. The results showed that placing the serpentine tube rows more distant to each other increases the ice formation so that the ice formation rate for the highest serpentine tube row distance compared to when the serpentine tube row distance is the lowest is higher by 24.68%. On the contrary, with a larger tube diameter, the rate of ice formation was decreased so that the smallest diameter had almost 5.9% more ice formation rate in comparison with the case with the largest tube diameter.

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“…Due to the complexity of active methods and their limitation for not being functional without an external energy source, passive methods are more common. Implementing fins, fluid additives, swirls flow devices, and porous mediums can be placed in this category. Kiwan and Al‐Nimr have numerically examined the thermal performance of a channel with the porous fins attached to a hot wall.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

Baou

Afsharpanah

Delavar

2019

Heat Trans. Asian Res.

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A vehicle radiator is used for cooling down the hot working fluid with airflow passing over its flow passages and fins.The proper design of the radiator is very important due to space and weight limitations in automobiles. In this study, a numerical investigation has been conducted on the improvements, which can be obtained by implementing different porous fins in the radiator channels.The effects of different porous fin configurations with the same porous media volume on the heat transfer rate and pressure drop were investigated. The coefficient of performance values were presented for evaluating the overall performance. The investigated geometries included horizontal, vertical, corrugated, and wavy-corrugated configurations. The results showed that the corrugated pattern had the best thermal performance among these geometries while the horizontal configuration presented the lowest pressure loss, even though the best overall performance belonged to wavy-corrugated configuration. After selecting this configuration, the influence of different porous materials on the radiator performance was studied. Finally, the radiator with the optimum porous media configuration and material was compared to a conventional radiator. It was found that implementing this porous media in the radiator channels improves its overall thermal performance factor up to 237%. K E Y W O R D Sheat exchanger, heat transfer enhancement, porous media, pressure drop, thermal performance, vehicle radiator

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Numerical study of heat transfer enhancement using perforated dual twisted tape inserts in converging‐diverging tubes

Cited by 19 publications

References 41 publications

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

Numerical simulation of solidification process in an ice-on-coil ice storage system with serpentine tubes

Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

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