The effect on heat-transfer augmentation by channel width in a sinusoidal wave channel.

Oyakawa, Kenyu; Shinzato, Takao; Mabuchi, Ikuo

doi:10.1299/kikaib.54.1400

Cited by 4 publications

(6 citation statements)

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“…The maximum heat transfer coefficient for each wave was located approximately 1.4 cm upstream of the peak of each wave due to the impingement of the free shear layer separated from the previous wave. This means that the location of maximum heat transfer (point of reattachment) on each wave is at about x = 0.79P, which is higher than suggested by Oyakawa et al (1989). This could be due to the difference between the two geometries (their geometry included a duct with two opposite wavy walls).…”

Section: Discussion Of Resultsmentioning

confidence: 66%

“…Ektesabi and Sako (1991a) conducted flow visualizations and pressure drop measurements for wavy sinusoidal channels and expressed the friction factor as a function of Reynolds number /= C Re", where C and n were expressed as a function of the channel geometry. Oyakawa et al (1989) investigated the local heat transfer coefficients and friction factor for a wavy channel and concluded that the location of maximum heat transfer on each wave is independent of the height of the channel (spacing between the two opposite wavy walls). Finally, Nishimura et al (1990) performed mass transfer and flow observations in symmetric wavy-walled and arc-shape walled channels.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…The experimental technique employed liquid crystals to provide localized measurements. This technique was first described by Simonich and Moffat (1982) who used cholesteric encapsulated liquid crystals to map temperature contours on the end wall of a cylinder in crossflow. Hippensteele et al (1983) used the same technique for measurements of local heat transfer on several geometries such as jet impingement on a flat plate.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Heat Transfer Characteristics in a Wavy-Walled Channel

Saniei

Dini

1993

Journal of Heat Transfer

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Section: Discussion Of Resultsmentioning

confidence: 66%

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Section: Introduction and Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Heat Transfer Characteristics in a Wavy-Walled Channel

Saniei

Dini

1993

Journal of Heat Transfer

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“…The wavelength-towidth ratio of channel is about 7 [13]. The pressure-drop factor correlation suggested by Hesselgreaves [5] is given as Oyakawað1989Þ : f ¼ 11:0Re À0:53 ; 4 Â 10 3 < Re < 10 5 :…”

Section: Comparison With Past Correlationsmentioning

confidence: 99%

Heat transfer and pressure drop correlations of microchannel heat exchangers with S-shaped and zigzag fins for carbon dioxide cycles

Ngo¹,

Kato²,

Nikitin³

et al. 2007

Experimental Thermal and Fluid Science

284

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“…Some correlations applicable for PCHE are summarized in Table 5 and 6. In this study, Oyakawa & Shinzato (1989)'s correlations were selected, which were originally developed for wavy channels. The main advantage of them is that the waviness effect of channel is considered.…”

Section: Phx3mentioning

confidence: 99%

HyPEP FY-07 Report: Initial Calculations of Component Sizes, Quasi-Static, and Dynamics Analyses

Oh¹

2007

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The Very High Temperature Gas-Cooled Reactor (VHTR) coupled to the High Temperature Steam Electrolysis (HTSE) process is one of two reference integrated systems being investigated by the U.S. Department of Energy and Idaho National Laboratory for the production of hydrogen. In this concept a VHTR outlet temperature of 900 °C provides thermal energy and high efficiency electricity for the electrolysis of steam in the HTSE process. In the second reference system the Sulfur Iodine (SI) process is coupled to the VHTR to produce hydrogen thermochemically. This report describes component sizing studies and control system strategies for achieving plant production and operability goals for these two reference systems. The optimal size and design condition for the intermediate heat exchanger, one of the most important components for integration of the VHTR and HTSE plants, was estimated using an analytic model. A partial load schedule and control system was designed for the integrated plant using a quasi-static simulation. Reactor stability for temperature perturbations in the hydrogen plant was investigated using both a simple analytic method and a dynamic simulation. Potential efficiency improvements over the VHTR/HTSE plant were investigated for an alternative design that directly couples a High Temperature Steam Rankin Cycle (HTRC) to the HTSE process. This work was done using the HYSYS code and results for the HTRC/HTSE system were compared to the VHTR/HTSE system. Integration of the VHTR with SI process plants was begun. Using the ASPEN plus code the efficiency was estimated. Finally, this report describes planning for the validation and verification of the HYPEP code. iv v

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The effect on heat-transfer augmentation by channel width in a sinusoidal wave channel.

Cited by 4 publications

References 0 publications

Heat Transfer Characteristics in a Wavy-Walled Channel

Heat Transfer Characteristics in a Wavy-Walled Channel

Heat transfer and pressure drop correlations of microchannel heat exchangers with S-shaped and zigzag fins for carbon dioxide cycles

HyPEP FY-07 Report: Initial Calculations of Component Sizes, Quasi-Static, and Dynamics Analyses

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