Investigation of flow characteristics and heat transfer enhancement of corrugated duct geometries

Tokgöz, Nehir; Aksoy, Muhammed Necati Murat; Şahi̇n, Beşi̇r

doi:10.1016/j.applthermaleng.2017.03.013

Cited by 55 publications

(11 citation statements)

References 31 publications

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“…The main research efforts over the last five years have been focused on investigating spirally or transversally corrugated tubes and channels, fins or inserts of wavy strip tapes, and other techniques that allow disturbance of thermal boundary layers [8][9][10][11][12][13][14][15][16]. A concept of fluted tubes was investigated by Srinivasan et al [12].…”

Section: Introductionmentioning

confidence: 99%

Elliptical double corrugated tubes for enhanced heat transfer

Navickaitė

Cattani

Bahl

2019

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Elliptical double corrugated tubes for enhanced heat transfer

Navickaitė

Cattani

Bahl

2019

International Journal of Heat and Mass Transfer

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“…For example, the effects of the rectangular cross-sectional ribs on heat transfer have been considered for the staggered arrangement (Mayle [5], Webb and Ramadhyani [6], Liu and Wang [7], Wongcharee et al [8], Desrues et al [9], Xie et al [10], Marocco and Franco [11]). On the other hand, the rectangular ribs have also been investigated in terms of the symmetrical arrangement (Hwang and Liou [12], Lopez et al [13], Tafti [14], Pourmahmoud et al [15], Tokgoz et al [16]). In some studies for the comparison, staggered and symmetrical arrangements have been given together for the rectangular cross-sectional ribs (Promvonge and Thianpong [17], Skullong et al [18], Vanaki and Mohammed [19], Yang et al [20]).…”

Section: Introductionmentioning

confidence: 99%

Visualization of flow characteristics between the ribbed plates via particle image velocimetry

2021

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Heat transfer is considerably influenced by flow stagnation, separation and reattachment regions due to the ribbed plates. Placing the ribs such as fins, turbulators that trigger the flow separation, enhances the heat transfer inside the channel by increasing the turbulence intensity. The flow separation is caused by disturbing the thermal and hydrodynamic development lengths. Moreover, these ribs also make an impact that increases the heat transfer by enlarging the heat transfer area. However, the ribs lead to the increment of the required pumping power in the meantime due to the increasing pressure loss in such systems. This aforementioned method is used for the heat exchangers, the solar collectors, the cooling of electronic devices. The investigation of the flow characteristics is very crucial to understand the heat transfer mechanism in the ducts for this reason. In the present paper, the flow characteristics between the plates have been experimentally researched. Particle Image Velocimetry system in the open water channel of Selcuk University Advanced Technology Research and Application Center has been used. The smooth plates have been taken as the reference model and used for the comparison with the plates having the rectangular cross-sectional ribs. The ribs with various heights of 0.1 ≤ h' = h/H ≤ 0.3 have been symmetrically placed on the internal surfaces of the plates via several spacing values of 0.5 ≤ S' = S/H ≤ 1 for varying Reynolds numbers as 10000 ≤ Re ≤ 20000. As a result, the flow characteristics have been given in terms of the contour graphics for velocity vector field, velocity components and vorticity.

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“…A rough surface is one of the techniques for passively enhancing the heat transfer. For decades, finned tubes [12,13], coiled tubes [14], inserts [15,16], and corrugated tubes [17][18][19][20][21][22] have been extensively studied. The effects of enhanced geometries on the heat transfer of boiling refrigerants have been addressed in several studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures

2021

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The heat transfer and pressure drop characteristics of R290 flow boiling in a corrugated tube were investigated through computational fluid dynamics (CFD) in this study. We established a model of flow boiling in a corrugated tube with different corrugated structures (rectangular and circular corrugations) and validated the model using the Liu–Winterton and Xu–Fang empirical equations. The heat transfer coefficient (HTC) and pressure drop were obtained at a mass flow rate of 0.04–0.2 kg/s and a water inlet temperature of 310–330 K. The results show that the HTC and the drop in the pressure of the corrugated tubes both obviously increased compared with a smooth tube as the mass flow rate increased. The HTC decreased for the three tubes as the water inlet temperature increased, while the drop in pressure slightly increased for the three tubes. Moreover, the corrugated structure was found to significantly enhance the heat transfer; the heat transfer enhancement factor (E1) of the corrugated tube with the rectangular corrugations and the corrugated tube with the circular corrugations was 2.01–2.36 and 1.67–1.98, respectively. The efficiency index (I) for both the rectangular corrugated pipe and the circular corrugated pipe was greater than 1 (1.05–1.24 and 1.13–1.29, respectively). The application of corrugated tubes with round and rectangular corrugations can reduce the heat transfer area required for the exchange of heat and, thus, reduce the cost.

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Investigation of flow characteristics and heat transfer enhancement of corrugated duct geometries

Cited by 55 publications

References 31 publications

Elliptical double corrugated tubes for enhanced heat transfer

Elliptical double corrugated tubes for enhanced heat transfer

Visualization of flow characteristics between the ribbed plates via particle image velocimetry

Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures

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