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Heat and Mass Transfer

, Volume 46, Issue 11–12, pp 1229–1237 | Cite as

Strength characteristics of the self-sustained wave in grooved channels with different groove length

  • Faming Sun
  • Yongning BianEmail author
  • Hirofumi Arima
  • Yasuyuki Ikegami
  • Xinsheng Xu
Original

Abstract

The self-sustained oscillations arising in a series of grooved channels are investigated experimentally. Pressure drop, time-averaged and time-various local pressure in the grooved channels with six kinds of groove length are measured with the differential transducer and the pressure sensor, respectively, and the flow structures are visualized using the aluminum dust method. The local pressure signal shows that the self-sustained wave appears in the first or second frequency, and the Strouhal number, based on the nature frequency of the self-sustained wave, is almost equivalent for the first or second frequency in the same channel. Meanwhile, the Strouhal number for each channel decreases monotonously with the groove length. Furthermore, it is found that increasing pressure will result in higher amplitude of the self-sustained wave, this behavior is significant for the efficient heat transfer in practical engineering.

Keywords

Reynolds Number Friction Factor Strength Characteristic Strouhal Number Laminar Flow Regime 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

f

Friction factor (−)

fT

Frequency of oscillation (Hz)

h

Depth of groove (mm)

l

Length of groove (mm)

L

Grooved period length (mm)

LP

Distance for total differential pressure (mm)

Pn

Local pressure (kPa)

P+

Pressure increase (kPa)

P

Pressure decrease (kPa)

ΔP

Overall pressure drop (Pa)

Q

Flow rate (m3 s−1)

Re

Reynolds number for steady flow (−)

Rec

Critical Reynolds number (−)

St

Strouhal number (−)

u

Characteristic flow velocity (m s−1)

um

Mean flow velocity (m s−1)

W

Width of the test section (mm)

Greek symbols

μ

Viscosity of working fluid (Pa s)

ρ

Density of working fluid (kg m−3)

Notes

Acknowledgments

This study was supported by the Cooperative Research Program of IOES (No. 08011A) and the Open Foundation of the State Key Laboratory of Structural Analysis for Industrial Equipment (No. S09203).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Faming Sun
    • 1
  • Yongning Bian
    • 2
    Email author
  • Hirofumi Arima
    • 1
  • Yasuyuki Ikegami
    • 1
  • Xinsheng Xu
    • 2
  1. 1.Institute of Ocean EnergySaga UniversitySagaJapan
  2. 2.State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalianPeople’s Republic of China

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