Heat transfer to pulsating turbulent flow in an abrupt pipe expansion

Said, S.A.M.; Habib, Mohamed A.; Iqbal, M.O.

doi:10.1108/09615530310464517

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…It shows that the Wammersley number has been reported [22,23]. Saeed et al [24] states that for liquids with a Prandtl number less than 1 in pulsating turbulence, a sudden expansion of the pipe was observed to increase the secular deviation of the heat transfer coefficient by around 10. Various turbulent models of pulsatile flow have been investigated to know the phenomenon of the influence of pulsation on the coefficient of heat transfer & to solve these complications with conflicting results.…”

Section: Introductionmentioning

confidence: 88%

“…The effect of various input parameters on the Nusselt numbers are studied in last decade documented by some of the researchers [17][18][19][20][21]. This researcher showed the relationship between the Nusselt number and the amplitude and frequency of a numerical study of turbulent pulsatile flow conducted by several researchers [22][23][24], which is optimal for increasing heat transfer coefficient. It shows that the Wammersley number has been reported [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Features of Pulsating Turbulent Flow in a Pipe: Experimental Optimization

Nishandar¹,

Pise²,

Mhamane³

2023

Advances in Computer Science Research

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The heat transmission improvement methods are widely utilized to raise the level of performance of the latent heat storage systems, the heat pipe is a broadly used technique utilized to improve the transmission of heat enhancement technique. Current paper comprises use of the heat pipe to vary the heat input, pulsating frequency, and flow velocity. The Heat input is varied in 0, 25, 50, 75 and 100 watts; pulsating frequency in upstream and downstream with frequency changed from 0 to 3.33 Hz; Flow velocity varied and calculated from Reynolds number which varies from 6000 to 13000. The experimental results were carried out using the design of experiments with output parameters as coefficient of heat transfer along with Nusselt number. The behavior of coefficient of heat transfer with respect to input parameters is discussed. The Analysis of variance is accustomed to check the reliability of the outcomes. The optimized input response selected using Particle swirm optimization shows Pulsating frequency of 3.33 Hz, Heat input of 100 W and Reynolds number of 13443 giving optimum heat transfer coefficient.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Heat Transfer Features of Pulsating Turbulent Flow in a Pipe: Experimental Optimization

Nishandar¹,

Pise²,

Mhamane³

2023

Advances in Computer Science Research

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“…Said et al [7] have investigated flow and heat transfer characteristics of pulsating flow downstream of an abrupt expansion for different frequencies (5 to 35 Hz), Reynolds numbers (5 and 10·10 5 ), expansion ratios (0.2 and 0.6), and Prandtl numbers (0.7 and 7.0). They reported that the influence of pulsation on the mean time-averaged Nusselt number is insignificant for fluids having a Prandtl number less than unity, while the increase is around 30% for fluids having a Prandtl number greater than unity.…”

Section: Introductionmentioning

confidence: 99%

Flow and heat transfer characteristics downstream of a porous sudden expansion: A numerical study

Alammar¹

2011

THERM SCI

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Incompressible, axisymmetric laminar flow downstream of a porous expansion is simulated. Effect of the Darcy number and inertia coefficient on flow and heat transfer characteristics downstream of the expansion is investigated. The simulation revealed circulation downstream of the expansion. Decreasing the Darcy number is shown to decrease the circulation region. The Nusselt number, friction coefficient, and pressure drop are shown to increase, while reattachment and location of maximum heat transfer move upstream with decreasing Darcy number. Similar effects are observed with increasing inertia coefficient.

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“…In contrast, Zemanick and Dougall [23] obtained different results for air flow at Re above 30000, especially at the peak of the Nusselt number. Said et al [24] carried out a numerical study of the heat transfer to fluid flow in an abrupt expansion with Re at 4•10 4 to 5•10 4 , an expansion ratio from 0.2 to 0.6 and a Prandtl number from 0.7 to 7. They observed that these boundary conditions have a significant effect on the mean time average Nusselt number with Prandtl number greater than unity.…”

Section: Introductionmentioning

confidence: 99%

Augmented of turbulent heat transfer in an annular pipe with abrupt expansion

et al. 2016

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This paper presents a study of heat transfer to turbulent air flow in the abrupt axisymmetric expansion of an annular pipe. The experimental investigations were performed in the Reynolds number range from 5000 to 30000, the heat flux varied from 1000 to 4000 W/m 2 , and the expansion ratio was maintained at D/d=1, 1.25, 1.67, and 2. The sudden expansion was created by changing the inner diameter of the entrance pipe to an annular passage. The outer diameter of the inner pipe and the inner diameter of the outer pipe are 2.5 and 10 cm, respectively, where both of the pipes are subjected to uniform heat flux. The distribution of the surface temperature of the test pipe and the local Nusselt number are presented in this investigation. Due to sudden expansion in the cross-section of the annular pipe, a separation flow was created, which enhanced the heat transfer. The reduction of the surface temperature on the outer and inner pipes increased with the increase of the expansion ratio and the Reynolds number, and increased with the decrease of the heat flux to the annular pipe. The peak of the local Nusselt number was between 1.64 and 1.7 of the outer and inner pipes for Reynolds numbers varied from 5000 to 30000, and the increase of the local Nusselt number represented the augmentation of the heat transfer rate in the sudden expansion of the annular pipe. This research also showed a maximum heat transfer enhancement of 63-78% for the outer and inner pipes at an expansion ratio of D/d = 2 at a Re = 30000 and a heat flux of 4000 W/m 2 .

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Heat transfer to pulsating turbulent flow in an abrupt pipe expansion

Cited by 10 publications

References 20 publications

Heat Transfer Features of Pulsating Turbulent Flow in a Pipe: Experimental Optimization

Heat Transfer Features of Pulsating Turbulent Flow in a Pipe: Experimental Optimization

Flow and heat transfer characteristics downstream of a porous sudden expansion: A numerical study

Augmented of turbulent heat transfer in an annular pipe with abrupt expansion

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