### 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) |
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Pages (from-to) | 1471-1474 |

Number of pages | 4 |

Journal | Physics of Fluids |

Volume | 19 |

Issue number | 10 |

DOIs | |

State | Published - Jan 1 1976 |

### ASJC Scopus subject areas

- Computational Mechanics
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Fluid Flow and Transfer Processes

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## Cite this

Bilger, R. W., Antonia, R. A., & Sreenivasan, K. R. (1976). Determination of intermittency from the probability density function of a passive scalar.

*Physics of Fluids*,*19*(10), 1471-1474. https://doi.org/10.1063/1.861348