### Abstract

The probability density functions of temperature in the intermittent regions of heated jet and wake flows show a strong spike associated with the temperature of the unheated fluid. The fine structure of this spike fits a Gaussian curve quite closely, and the area under this Gaussian gives an accurate measure of 1-γ where γ is the intermittency factor. The standard deviation of the Gaussian is a measure of the noise due to residual temperature fluctuations in the free-stream and the electronic noise in the measurement system. The accuracy with which the intermittency can be determined is limited by the signal-to-noise ratio.

Original language | English (US) |
---|---|

Pages (from-to) | 1471-1474 |

Number of pages | 4 |

Journal | Physics of Fluids |

Volume | 19 |

Issue number | 10 |

State | Published - 1976 |

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### ASJC Scopus subject areas

- Condensed Matter Physics
- Physics and Astronomy(all)
- Mechanics of Materials
- Computational Mechanics
- Fluid Flow and Transfer Processes

### Cite this

*Physics of Fluids*,

*19*(10), 1471-1474.

**Determination of intermittency from the probability density function of a passive scalar.** / Bilger, R. W.; Antonia, R. A.; Sreenivasan, K. R.

Research output: Contribution to journal › Article

*Physics of Fluids*, vol. 19, no. 10, pp. 1471-1474.

}

TY - JOUR

T1 - Determination of intermittency from the probability density function of a passive scalar

AU - Bilger, R. W.

AU - Antonia, R. A.

AU - Sreenivasan, K. R.

PY - 1976

Y1 - 1976

N2 - The probability density functions of temperature in the intermittent regions of heated jet and wake flows show a strong spike associated with the temperature of the unheated fluid. The fine structure of this spike fits a Gaussian curve quite closely, and the area under this Gaussian gives an accurate measure of 1-γ where γ is the intermittency factor. The standard deviation of the Gaussian is a measure of the noise due to residual temperature fluctuations in the free-stream and the electronic noise in the measurement system. The accuracy with which the intermittency can be determined is limited by the signal-to-noise ratio.

AB - The probability density functions of temperature in the intermittent regions of heated jet and wake flows show a strong spike associated with the temperature of the unheated fluid. The fine structure of this spike fits a Gaussian curve quite closely, and the area under this Gaussian gives an accurate measure of 1-γ where γ is the intermittency factor. The standard deviation of the Gaussian is a measure of the noise due to residual temperature fluctuations in the free-stream and the electronic noise in the measurement system. The accuracy with which the intermittency can be determined is limited by the signal-to-noise ratio.

UR - http://www.scopus.com/inward/record.url?scp=36749105306&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36749105306&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:36749105306

VL - 19

SP - 1471

EP - 1474

JO - Physics of Fluids

JF - Physics of Fluids

SN - 1070-6631

IS - 10

ER -