### Abstract

One-dimensional transient and steady-state models describing the process of material removal by vaporization and liquid expulsion using a concentrated heat source are developed and presented. Before melting occurs, the conduction has a known analytical similarity solution. This provides the initial temperature field for the melting problem. Before vaporization occurs, the heat transfer in liquid and solid phases is solved by moving boundary immobilization transformation so that the liquid and solid regions become fixed domains. When vaporization commences, there exists a discontinuity across the Knudsen layer of a few molecular mean free paths. This discontinuity is modeled by a Mott-Smith type solution. The vaporization process creates a recoil pressure which pushes the vapor away from the target and expels the liquid. The materials are, therefore, removed in both vapor and liquid phases. The materials removal rates are incorporated in the moving boundary immobilization transformation. The vapor phase is assumed to be optically thin so that its absorption of the high energy beam is negligible. Finite difference solution is obtained for the transient model. Closed form analytical solutions are obtained for the steady-state.

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

Title of host publication | Unknown Host Publication Title |

Publisher | ASME |

Pages | 283-292 |

Number of pages | 10 |

Volume | 3 |

State | Published - 1987 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*Unknown Host Publication Title*(Vol. 3, pp. 283-292). ASME.

**MATERIALS REMOVAL BY VAPORIZATION AND LIQUID EXPULSION USING A CONCENTRATED HEAT SOURCE.** / Chan, Cholik; Mazumder, J.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Unknown Host Publication Title.*vol. 3, ASME, pp. 283-292.

}

TY - GEN

T1 - MATERIALS REMOVAL BY VAPORIZATION AND LIQUID EXPULSION USING A CONCENTRATED HEAT SOURCE.

AU - Chan, Cholik

AU - Mazumder, J.

PY - 1987

Y1 - 1987

N2 - One-dimensional transient and steady-state models describing the process of material removal by vaporization and liquid expulsion using a concentrated heat source are developed and presented. Before melting occurs, the conduction has a known analytical similarity solution. This provides the initial temperature field for the melting problem. Before vaporization occurs, the heat transfer in liquid and solid phases is solved by moving boundary immobilization transformation so that the liquid and solid regions become fixed domains. When vaporization commences, there exists a discontinuity across the Knudsen layer of a few molecular mean free paths. This discontinuity is modeled by a Mott-Smith type solution. The vaporization process creates a recoil pressure which pushes the vapor away from the target and expels the liquid. The materials are, therefore, removed in both vapor and liquid phases. The materials removal rates are incorporated in the moving boundary immobilization transformation. The vapor phase is assumed to be optically thin so that its absorption of the high energy beam is negligible. Finite difference solution is obtained for the transient model. Closed form analytical solutions are obtained for the steady-state.

AB - One-dimensional transient and steady-state models describing the process of material removal by vaporization and liquid expulsion using a concentrated heat source are developed and presented. Before melting occurs, the conduction has a known analytical similarity solution. This provides the initial temperature field for the melting problem. Before vaporization occurs, the heat transfer in liquid and solid phases is solved by moving boundary immobilization transformation so that the liquid and solid regions become fixed domains. When vaporization commences, there exists a discontinuity across the Knudsen layer of a few molecular mean free paths. This discontinuity is modeled by a Mott-Smith type solution. The vaporization process creates a recoil pressure which pushes the vapor away from the target and expels the liquid. The materials are, therefore, removed in both vapor and liquid phases. The materials removal rates are incorporated in the moving boundary immobilization transformation. The vapor phase is assumed to be optically thin so that its absorption of the high energy beam is negligible. Finite difference solution is obtained for the transient model. Closed form analytical solutions are obtained for the steady-state.

UR - http://www.scopus.com/inward/record.url?scp=0023268334&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0023268334&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0023268334

VL - 3

SP - 283

EP - 292

BT - Unknown Host Publication Title

PB - ASME

ER -