Visualization of Turbulent Heat Transfer to a Water Flow in a Circular Pipe Using High-Speed Infrared Thermography

Shiibara, Naoki; Nakamura, Hajime; Yamada, S.

doi:10.1615/jflowvisimageproc.2014010365

Cited by 10 publications

(9 citation statements)

References 2 publications

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“…In contrast, the restoration rate gradually decreased with increasing frequency at f > 10 Hz, and became approximately  at f = 80 Hz. Under the present experimental condition, the attenuation increased with the Reynolds number at Re D ≥ 15,000 for the fully developed pipe flow, because a part of the fluctuation frequency exceeded 80 Hz (Shiibara et al, 2013). Figure 5 shows the Nusselt number measured at z/D = 10.8 (z = 220 mm) with respect to the Reynolds number, Re D .…”

Section: Calculation Of Heat Transfer Coefficientmentioning

confidence: 76%

“…(4) to the original value, decreases with increasing frequency. In order to examine the effect of this feature, a simple one-dimensional heat conduction analysis (along the thickness direction) was conducted for the condition of a fully developed pipe flow at Re D = 12,100 (Shiibara et al, 2013). As a result, the restoration rate Fig.…”

Section: Calculation Of Heat Transfer Coefficientmentioning

confidence: 99%

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Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography

Shiibara

Nakamura

Yamada

2015

Mechanical Engineering Journal

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The aim of the present study is to demonstrate the quantitative measurement of the spatio-temporal fluctuation of the heat transfer in a water pipe flow around an orifice plate. In the present study, a technique using high-speed infrared thermography was used to measure the heat transfer. The measurement was first performed for a fully developed pipe flow without installing an orifice plate in order to verify the validity of the measurement technique. The spatio-temporal distribution of the heat transfer coefficient was evaluated based on the temperature fluctuation of a heated thin-foil measured using high-speed infrared thermography, and the results indicated that quantitative measurement was possible not only for time-averaged values, but also for fluctuating values. The technique was then used to measure the heat transfer to the flow around an orifice plate (the bore ratio was approximately 0.5). As a result, it was revealed that the heat transfer downstream of the orifice fluctuated violently, and the instantaneous structure of the heat transfer was remarkably finer than the streaky structure for the fully developed pipe flow. The time-averaged value of the heat transfer had a maximum at approximately two diameters downstream of the orifice, where the rms value of the fluctuation and its characteristic frequency also became much higher than those for the fully developed pipe flow.

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Section: Calculation Of Heat Transfer Coefficientmentioning

confidence: 76%

Section: Calculation Of Heat Transfer Coefficientmentioning

confidence: 99%

Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography

Shiibara

Nakamura

Yamada

2015

Mechanical Engineering Journal

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“…Contemporary studies are characterized by a large number of trends, which relate to technology, flows in the environment, behavior of living organisms in the ocean and in the atmosphere etc. [9][10][11][12][13][14][15].…”

Section: предметом исследования является нахождение общих интегралов mentioning

confidence: 99%

“…In this case, the calculation is conducted on the basis of experimental data and different physical models, implemented in the form of semi-empirical equations and computer programs [2][3][4]7]. The procedures, developed on the basis of this approach, are used in the process of designing heat exchange equipment [8] and water pipe-lines [2][3][4], for the calculation and visualization of processes of convective heat exchange, which are frequently complicated by the additional contributing factors [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Analytical description of the flow of the newtonian liquid in a round tube and on a horizontal plate

Budarin

2016

EEJET

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“…The results are averaged over time. Shiibara et al [9] measured the heat transfer characteristics by IR imaging of turbulent water flow in acrylic circular pipes with a high time resolution. Thermographic studies of nonisothermal turbulent liquid flows with a time resolution are virtually absent.…”

Section: Introductionmentioning

confidence: 99%

Thermographic study of turbulent water pulsations in nonisothermal mixing

Bol’shukhin¹,

Znamenskaya

Sveshnikov³

et al. 2014

Optoelectron.Instrument.Proc.

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The possibilities of using thermography for quantitative studies of the frequency characteristics of the nonisothermal water pulsations near the vessel walls transparent to infrared radiation are analyzed. Thermographic studies of the temperature dynamics in the contact zone of a nonisothermal liquid with the wall were performed using simple models. Frequencies of temperature fluctuations at the inner surface of the vessel through the wall transparent to infrared radiation were measured using a thermal imager with accurate focusing of the lens. Spectral curves of the fluctuations were constructed with the use of a Fourier transform. It is shown that Kolmogorov spectra (−5/3 law) are present in the nonisothermal flow in a T-junction channel, allowing the process to be characterized as developed turbulence of the water flow in the region of the boundary layer adjacent to the window.

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Visualization of Turbulent Heat Transfer to a Water Flow in a Circular Pipe Using High-Speed Infrared Thermography

Cited by 10 publications

References 2 publications

Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography

Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography

Analytical description of the flow of the newtonian liquid in a round tube and on a horizontal plate

Thermographic study of turbulent water pulsations in nonisothermal mixing

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