Detailed measurements of local heat transfer coefficients in turbulent flow through smooth and rib-roughened serpentine passages with a 180° sharp bend

Mochizuki, Sadanari; Murata, Akira; Shibata, Ryo; Yang, Wen‐Jei

doi:10.1016/s0017-9310(98)00308-1

Cited by 65 publications

(21 citation statements)

References 17 publications

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“…An efficient design of these passages requires obtaining effective overall cooling of the components for the least pressure drop. Over the years the researchers [2][3][4][5] have investigated heat transfer and pressure drop in a two-pass smooth channel. Also, while investigating heat transfer and pressure drop in channels with different heat transfer enhancement techniques, smooth channel data has been used as baseline by researchers [6][7][8][9].…”

Section: List Of Symbolsmentioning

confidence: 99%

“…Over the years the researchers [2][3][4][5] have investigated heat transfer and pressure drop in a two-pass smooth channel. Also, while investigating heat transfer and pressure drop in channels with different heat transfer enhancement techniques, smooth channel data has been used as baseline by researchers [6][7][8][9]. Studies by Schabacker et al [10], Liou et al [11], Chen et al [12], Son et al [13] and Elfert et al [14] have focused attention on the two-pass channels to study flow, pressure distribution and heat transfer characteristics.…”

Section: List Of Symbolsmentioning

confidence: 99%

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Flow structure, heat transfer and pressure drop in varying aspect ratio two-pass rectangular smooth channels

Siddique

El-Gabry

Shevchuk³

et al. 2011

Heat Mass Transfer

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Two-pass channels are used for internal cooling in a number of engineering systems e.g., gas turbines. Fluid travelling through the curved path, experiences pressure and centrifugal forces, that result in pressure driven secondary motion. This motion helps in moving the cold high momentum fluid from the channel core to the side walls and plays a significant role in the heat transfer in the channel bend and outlet pass. The present study investigates using Computational Fluid Dynamics (CFD), the flow structure, heat transfer enhancement and pressure drop in a smooth channel with varying aspect ratio channel at different divider-to-tip wall distances. Numerical simulations are performed in two-pass smooth channel with aspect ratio W in /H = 1:3 at inlet pass and W out /H = 1:1 at outlet pass for a variety of divider-to-tip wall distances. The results show that with a decrease in aspect ratio of inlet pass of the channel, pressure loss decreases. The divider-totip wall distance (W el ) not only influences the pressure drop, but also the heat transfer enhancement at the bend and outlet pass. With an increase in the divider-to-tip wall distance, the areas of enhanced heat transfer shifts from side walls of outlet pass towards the inlet pass. To compromise between heat transfer and pressure drop in the channel, W el /H = 0.88 is found to be optimum for the channel under study.

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Section: List Of Symbolsmentioning

confidence: 99%

Section: List Of Symbolsmentioning

confidence: 99%

Flow structure, heat transfer and pressure drop in varying aspect ratio two-pass rectangular smooth channels

Siddique

El-Gabry

Shevchuk³

et al. 2011

Heat Mass Transfer

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“…In this con®guration, the¯ow follows a series of turns that interrupt growth of the boundary layer repetitively and keep its size minimal. This decreases both dispersion (Curtis and Shahwan, 1988;Waiz et al, 2001) and the resistance to mass and heat transfer (Choi and Anand, 1995;Choi et al, 1996;Kalb and Seader, 1972;Mochizuki, 1999;Snyder et al, 1993;Tanishita et al, 1991). The BioScope consists of 20 serpentine units between which 11 sampling ports are located.…”

Section: Description Of the Sampling Systemmentioning

confidence: 99%

Rapid sampling for analysis of in vivo kinetics using the BioScope: A system for continuous‐pulse experiments

Visser¹,

Zuylen²,

Dam³

et al. 2002

Biotech & Bioengineering

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In this article we present a novel device, the BioScope, which allows elucidation of in vivo kinetics of microbial metabolism via perturbation experiments. The perturbations are carried out according to the continuous-flow method. The BioScope consists of oxygen permeable silicon tubing, connected to the fermentor, through which the broth flows at constant velocity. The tubing has a special geometry (serpentine channel) to ensure plug flow. After leaving the fermentor, the broth is mixed with a small flow of perturbing agent. This represents the start of the perturbation. The broth is sampled at different locations along the tubing, corresponding to different incubation times. The maximal incubation time is 69 s; the minimally possible time interval between the samples is 3-4 s. Compared to conventional approaches, in which the perturbation is carried out in the fermentor, the BioScope offers a number of advantages. (1) A large number of different perturbation experiments can be carried out on the same day, because the physiological state of the fermentor is not perturbed. (2) In vivo kinetics during fed-batch experiments and in large-scale reactors can be investigated. (3) All metabolites of interest can be measured using samples obtained in a single experiment, because the volume of the samples is unlimited. (4) The amount of perturbing agent spent is minimal, because only a small volume of broth is perturbed. (5) The system is completely automated. Several system properties, including plug-flow characteristics, mixing, oxygen and carbon dioxide transfer rates, the quenching time, and the reproducibility have been explored, with satisfactory results. Responses of several glycolytic intermediates in Saccharomyces cerevisiae to a glucose pulse, measured using a conventional approach are compared to results obtained with the BioScope. The agreement between the results demonstrates that the BioScope is indeed a promising device for studying in vivo kinetics.

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“…Therefore, understanding of the unsteady heat transfer in sharp 180°bends is important. Heat and Fluid Flow 24 (2003) [67][68][69][70][71][72][73][74][75][76] Previous studies on the flow around sharp 180°bends have mostly focused on higher (Re P 10 4 ) Reynolds numbers (Metzger and Sahm, 1986;Chyu, 1991;Hirota et al, 1999;Mochizuki et al, 1999;Liou et al, 2000). At these Reynolds numbers, industrial applications include ventilation piping systems and inter-cooling passages in gas turbine blades.…”

Section: Introductionmentioning

confidence: 99%

Unsteady laminar flow and convective heat transfer in a sharp 180° bend

Chung

Tucker

Roychowdhury

2003

International Journal of Heat and Fluid Flow

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Detailed measurements of local heat transfer coefficients in turbulent flow through smooth and rib-roughened serpentine passages with a 180° sharp bend

Cited by 65 publications

References 17 publications

Flow structure, heat transfer and pressure drop in varying aspect ratio two-pass rectangular smooth channels

Flow structure, heat transfer and pressure drop in varying aspect ratio two-pass rectangular smooth channels

Rapid sampling for analysis of in vivo kinetics using the BioScope: A system for continuous‐pulse experiments

Unsteady laminar flow and convective heat transfer in a sharp 180° bend

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