Heat transfer characteristics of pulsated turbulent pipe flow

Habib, Mohamed A.; Said, S.A.M.; Al‐Farayedhi, Abdulghani A.; Al‐Dini, Salem A.; Asghar, Asad; Gbadebo, Semiu A.

doi:10.1007/s002310050277

Cited by 31 publications

(10 citation statements)

References 26 publications

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“…The behaviour of the Nusselt number with diameter ratio can be explained in view of the bursting phenomena using the turbulent bursting model (Genin et al , 1992; Liao and Wang, 1985). This model defines certain regions on the frequency‐Reynolds number plane such that depending on the region in this plane, the bursting frequency can be dependent or independent of the pulsation frequency (Habib et al , 1999). According to the results of Habib et al (1999), Mamayev et al (1976) and Liao and Wang (1985), heat transfer can be increased or decreased with Reynolds number and frequency.…”

Section: Resultsmentioning

confidence: 99%

Heat transfer to pulsating turbulent flow in an abrupt pipe expansion

Said

Habib

Iqbal

2003

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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A numerical investigation aimed at understanding the flow and heat transfer characteristics of pulsating turbulent flow in an abrupt pipe expansion was carried out. The flow patterns are classified by four parameters; the Reynolds number, the Prandtl number, the abrupt expansion ratio and the pulsation frequency. The influence of these parameters on the flow was studied in the range 104<Re<5×104, 0.7<Pr<7.0, 0.2<d/D<0.6 and 5<f<35. It was found that the influence of pulsation on the mean time‐averaged Nusselt number is insignificant (around 10 per cent increase) for fluids having a Prandtl number less than unity. This effect is appreciable (around 30 per cent increase) for fluids having Prandtl number greater than unity. For all pulsation frequencies, the variation in the mean time‐averaged Nusselt number, maximum Nusselt number and its location with Reynolds number and diameter ratio exhibit similar characteristics to steady flows.

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Section: Resultsmentioning

confidence: 99%

Heat transfer to pulsating turbulent flow in an abrupt pipe expansion

Said

Habib

Iqbal

2003

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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“…Compared to a steady flow, both an enhancement and a reduction of heat transfers, corresponding to different pulsation frequency ranges, were observed. In turbulent conditions (for a Reynolds numbers range of 5000 -29000), Habib et al [13] also found an increase or a decrease of heat transfer as a function of the pulsation frequency. The turbulent bursting mode was identified as a possible explanation for the observed heat transfer modification.…”

Section: Related Workmentioning

confidence: 95%

Heat Transfer Investigation in an Engine ExhaustType Pulsating Flow

Simonetti¹,

Caillol²,

Higelin³

et al. 2018

JFFHMT

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In many practical engineering situations, such as in the exhaust pipes of Internal Combustion Engines, heat is transferred under conditions of pulsating flow. In these conditions, the heat transfer mechanism is affected by the pulsating flow parameters. The objective of the present work was to experimentally investigate heat transfers for pulsatile turbulent flows in a pipe. A specific experimental apparatus able to reproduce a pulsating flow representative of the engine exhaust was designed. A stationary turbulent hot air flow with a Reynolds number ranging from 1.8x10 4 to 3.5x10 4 , based on the time averaged velocity, is excited through a pulsating mechanism and exchanges thermal energy with a steel pipe. Pulsation frequency ranges from 10 to 95 Hz. The effects of pulsation frequency and pipe length on the convective heat transfer were evaluated. It was observed that flow pulsation enhances convective heat transfers in comparison with the steady case. The results highlight that, when the flow is excited with a pulsation frequency equal to a resonance mode of the system, a local maximum of the heat transfer rate appears. This behaviour was found to be independent of the pipe length. Instantaneous measurements of air velocity and temperature demonstrated that the increase in the energy axial advection due to the oscillating component of the velocity is the major cause of the heat transfer enhancement.

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“…Several investigators (Wang and Zhang 2005) have numerically investigated fluid flow and heat transfer occurring in an oscillating turbulent pipe flow. But most of investigations (Zhao and Cheng 1998a, b;Baird et al 1966;Liao and Wang 1985;Mamayev et al 1976;Gbadebo et al 1999;Habib et al 1999Habib et al , 2004Havemann and Rao 1954) have been focused on the experimental investigations. Martinelli et al (1943) experimentally investigated the heat transfer characteristics of pulsating flow in a vertical tube and (Yin and Ma 2014) found that the heat transfer rate decreases as compared to that of the unidirectional steady flow for Reynolds numbers higher than 4,500.…”

Section: Heat Transfer In Turbulent Pulsating Flowmentioning

confidence: 98%

Oscillating Flow and Heat Transfer of Single Phase in Capillary Tubes

2015

Oscillating Heat Pipes

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Heat transfer characteristics of pulsated turbulent pipe flow

Cited by 31 publications

References 26 publications

Heat transfer to pulsating turbulent flow in an abrupt pipe expansion

Heat transfer to pulsating turbulent flow in an abrupt pipe expansion

Heat Transfer Investigation in an Engine ExhaustType Pulsating Flow

Oscillating Flow and Heat Transfer of Single Phase in Capillary Tubes

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