A critical review on the thermal performance of alternating cross-section tubes

Rukruang, Amawasee; Chimres, Nares; Kaew-On, Jatuporn; Mesgarpour, Mehrdad; Mahian, Omid

doi:10.1016/j.aej.2021.12.070

Cited by 8 publications

(2 citation statements)

References 35 publications

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“…This research was considered to be a basis for further study of cross-sectional area change. Likewise, Rukruang et al [34] analyzed the thermal performance of tubes with alternating cross sections, indicating that tubes with alternating cross sections have improved vorticity, improving the tube's thermal performance. In addition, Mimi-Elsaid et al [35] indicate that using a circular cross section of a helical tube has a higher heat transfer-per-unit pumping power that is higher than that of the elliptical cross section of a helical tube and the square cross section of a helical tube by approximately 23.08% and 84.61%, respectively.…”

Section: Discussionmentioning

confidence: 99%

CFD Analysis of Heat Transfer Enhancement in a Flat-Plate Solar Collector/Evaporator with Different Geometric Variations in the Cross Section

et al. 2023

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There is a growing demand from the industrial sector and the population to cover the need for water temperature increases that can be covered with systems such as heat pumps. The present research aims to increase the heat transfer to the working fluid in a collector/evaporator, part of a solar-assisted direct expansion heat pump. This research was developed using a numerical analysis and by applying computational fluid dynamics; different simulations were performed to compare the performances of collector/evaporators with models exhibiting variations in the cross-section profile under similar conditions. An average incident solar radiation of 464.1 W·m−2 was considered during the analysis. For the comparison, profiles with hexagon-, four-leaf clover-, and circular-shaped sections with floral shapes, among others, were analysed, resulting in a temperature increase at the outlet of the working fluid of 1.3 °C. In comparison, the collector/evaporator surface temperature varied between 4 and 13.8 °C, while the internal temperature of the fluid reached 11.21 °C. Finally, it is indicated that the best results were presented by analysing the profile corresponding to the circular section with the flower shape.

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Section: Discussionmentioning

confidence: 99%

CFD Analysis of Heat Transfer Enhancement in a Flat-Plate Solar Collector/Evaporator with Different Geometric Variations in the Cross Section

et al. 2023

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“…They reported that an alternating cross-section tube produced secondary flow and turbulence intensity through the tube curvature. Multi-longitudinal vortices formed along the length of the tube, which produced a significant enhancement in the heat transfer performance of the tube [28]. Furthermore, their study investigated the air-side performance of ACF tube heat exchangers with three hydraulic diameters of 4.16, 4.75, and 5.20 mm.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Convective Heat Transfer and Pressure Drop Characteristics of an Alternating Cross-Section Flattened Tube with Different Twist Angle

Warnropru¹,

Kaew-On²,

Chimres³

2023

ASEAN Sci Tech Rept

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In this research, the heat transfer coefficient (HTC) and pressure drop of alternating cross-section flattened (ACF) tubes were investigated experimentally and compared with the same parameters of a circular tube. Three different ACF tubes were fabricated from circular copper tubing with an internal diameter of 4.5 mm, a thickness of 1 mm, and a length of 400 mm. The twist angles were 30, 45, and 90°. The experimental ranges covered a mass flux of 729–1,434 kg/m2s and a heat flux of 12–30 kW/m2. The results showed that the HTC and pressure drop increased with mass flux. The HTC decreased with increments of heat flux, but the pressure drop did not change. The HTC and pressure drop of the ACF tubes were higher than those of the circular tube. The ACF tube with 90° twist angles produced the highest HTC, and the thermal performance of that tube was about 27% better than the thermal performance of the circular tube.

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Steam-side heat transfer analysis in spirally corrugated tube for grate furnace superheater

Chen,

Yang,

Kong

et al. 2023

Case Studies in Thermal Engineering

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A critical review on the thermal performance of alternating cross-section tubes

Cited by 8 publications

References 35 publications

CFD Analysis of Heat Transfer Enhancement in a Flat-Plate Solar Collector/Evaporator with Different Geometric Variations in the Cross Section

CFD Analysis of Heat Transfer Enhancement in a Flat-Plate Solar Collector/Evaporator with Different Geometric Variations in the Cross Section

Experimental Study on Convective Heat Transfer and Pressure Drop Characteristics of an Alternating Cross-Section Flattened Tube with Different Twist Angle

Steam-side heat transfer analysis in spirally corrugated tube for grate furnace superheater

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