### Abstract

A validated comprehensive axisymmetric numerical model, which includes the high pressure transient effects, variable thermo-physical properties and inert species solubility in the liquid phase, has been employed to study the evaporation of moving n-heptane droplets within a zero-gravity nitrogen environment, for a wide range of ambient pressures and initial freestream velocities. At the high ambient temperature considered (1000 K), the evaporation constant increases with the ambient pressure. At low ambient pressure, the evaporation constant becomes almost a constant during the end of the lifetime. At high ambient pressures, the transient behavior is present throughout the droplet lifetime. The final penetration distance of a moving droplet decreases exponentially with increasing ambient pressure. The average evaporation constant increases with ambient pressure. The variation is almost linear for reduced ambient pressures smaller than approximately 2. For higher values, depending on the initial freestream velocity, the average evaporation constant either becomes a constant (at low initial freestream velocities) or it non-linearly increases (at high initial freestream velocities) with the ambient pressure. Droplet lifetime decreases with increasing ambient pressure and/or increasing initial freestream velocity.

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

Pages (from-to) | 385-394 |

Number of pages | 10 |

Journal | International Communications in Heat and Mass Transfer |

Volume | 35 |

Issue number | 4 |

DOIs | |

State | Published - Apr 1 2008 |

### Fingerprint

### Keywords

- Axisymmetric model
- Droplet evaporation
- High pressure
- Zero-gravity

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics
- Chemical Engineering(all)
- Condensed Matter Physics

### Cite this

**Subcritical and supercritical droplet evaporation within a zero-gravity environment : Low Weber number relative motion.** / Zhang, Hongtao; Raghavan, Vasudevan; Gogos, George.

Research output: Contribution to journal › Article

*International Communications in Heat and Mass Transfer*, vol. 35, no. 4, pp. 385-394. https://doi.org/10.1016/j.icheatmasstransfer.2007.08.002

}

TY - JOUR

T1 - Subcritical and supercritical droplet evaporation within a zero-gravity environment

T2 - Low Weber number relative motion

AU - Zhang, Hongtao

AU - Raghavan, Vasudevan

AU - Gogos, George

PY - 2008/4/1

Y1 - 2008/4/1

N2 - A validated comprehensive axisymmetric numerical model, which includes the high pressure transient effects, variable thermo-physical properties and inert species solubility in the liquid phase, has been employed to study the evaporation of moving n-heptane droplets within a zero-gravity nitrogen environment, for a wide range of ambient pressures and initial freestream velocities. At the high ambient temperature considered (1000 K), the evaporation constant increases with the ambient pressure. At low ambient pressure, the evaporation constant becomes almost a constant during the end of the lifetime. At high ambient pressures, the transient behavior is present throughout the droplet lifetime. The final penetration distance of a moving droplet decreases exponentially with increasing ambient pressure. The average evaporation constant increases with ambient pressure. The variation is almost linear for reduced ambient pressures smaller than approximately 2. For higher values, depending on the initial freestream velocity, the average evaporation constant either becomes a constant (at low initial freestream velocities) or it non-linearly increases (at high initial freestream velocities) with the ambient pressure. Droplet lifetime decreases with increasing ambient pressure and/or increasing initial freestream velocity.

AB - A validated comprehensive axisymmetric numerical model, which includes the high pressure transient effects, variable thermo-physical properties and inert species solubility in the liquid phase, has been employed to study the evaporation of moving n-heptane droplets within a zero-gravity nitrogen environment, for a wide range of ambient pressures and initial freestream velocities. At the high ambient temperature considered (1000 K), the evaporation constant increases with the ambient pressure. At low ambient pressure, the evaporation constant becomes almost a constant during the end of the lifetime. At high ambient pressures, the transient behavior is present throughout the droplet lifetime. The final penetration distance of a moving droplet decreases exponentially with increasing ambient pressure. The average evaporation constant increases with ambient pressure. The variation is almost linear for reduced ambient pressures smaller than approximately 2. For higher values, depending on the initial freestream velocity, the average evaporation constant either becomes a constant (at low initial freestream velocities) or it non-linearly increases (at high initial freestream velocities) with the ambient pressure. Droplet lifetime decreases with increasing ambient pressure and/or increasing initial freestream velocity.

KW - Axisymmetric model

KW - Droplet evaporation

KW - High pressure

KW - Zero-gravity

UR - http://www.scopus.com/inward/record.url?scp=39149109583&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=39149109583&partnerID=8YFLogxK

U2 - 10.1016/j.icheatmasstransfer.2007.08.002

DO - 10.1016/j.icheatmasstransfer.2007.08.002

M3 - Article

AN - SCOPUS:39149109583

VL - 35

SP - 385

EP - 394

JO - International Communications in Heat and Mass Transfer

JF - International Communications in Heat and Mass Transfer

SN - 0735-1933

IS - 4

ER -