Heat transfer evaluation of turbulent flows through gear-ring elements

Ruengpayungsak, K.; Wongcharee, K.; Thianpong, Chinaruk; Pimsarn, Monsak; Chuwattanakul, V.; Eiamsa-ard, Smith

doi:10.1016/j.applthermaleng.2017.05.108

Cited by 32 publications

(24 citation statements)

References 32 publications

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“…In their numerical and experimental study, Ruengpayungsak et al used gearing elements as turbulator in tubes with different free‐space length ratios (1.0, 2.0, and 3.0) and tooth numbers (8, 16, and 24) with constant wall heat flux condition. The authors found that the maximum thermal performance factor of 1.3 is obtained by using the gear ring turbulators with the highest free space length ratio and maximum number of teeth.…”

Section: Introductioncontrasting

confidence: 99%

“…The use of turbulators in the annulus causes the variation in streamlines and pathlines resulting in generation of higher recirculation. This leads to higher turbulence intensity which causes more pressure drops, resulting in higher f ‐values. The f ‐values for the different configurations ( DR = 0.42, Re = 3500), ( DR = 0.475, Re = 3500), and ( DR = 0.53, Re = 3500) were 0.111, 0.103, and 0.0954, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The reason may be that lower DR and PR result in a stronger effect of the turbulators. This leads to higher recirculation, leading to a better mixing of the fluid , . Consequently, the heat transfer performance of the DPHE becomes improved.…”

Section: Resultsmentioning

confidence: 99%

“…The hot and cold fluids heat duties Q can be expressed as :

true Q_{normalh} = m_{normalh} C_{normalph} (T_{h, in} - T_{h, out})

true Q_{normalc} = m_{normalc} C_{normalpc} (T_{c, out} - T_{c, in})

…”

Section: Methodsmentioning

confidence: 99%

“…The studies are made using air as working fluid through the tubes and the DPHE. Studies have been reported for various pitch ratios (0.5–12) and diameter ratios in the range of 0.31–0.69 , . The thermal performance of turbulators at various pitch ratios and diameter ratios are limited in the literature.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Yadav

Sahu

2019

Chem Eng & Technol

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The heat transfer and pressure drop characteristics in annuli of a double-pipe heat exchanger (DPHE) using helical surface disc turbulators (HSDTs) are experimentally investigated. The effect of a helical surface disc turbulator is studied for three pitch ratios, three diameter ratios, and varying Reynolds numbers. Water flows in the inner tube and air through the annulus. The tests are conducted for air with uniform wall temperature condition. The heat exchanger with the least pitch ratio and least diameter ratio was found to exhibit the highest Nusselt number and pressure drop. The thermal performance factor turned out to be greater than unity for all cases. Correlations were developed for Nusselt number, friction factor, and thermal performance.

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Section: Introductioncontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The hot and cold fluids heat duties Q can be expressed as :