Characterisation of the flow in the molten metal sump during direct chill aluminium casting

Jason Reese

Research output: Contribution to journalArticle

Abstract

A recent analytical model for the liquid aluminum flow in a direct chill (DC) casting sump has been investigated and the scaling coefficients evaluated. The magnitudes of flow-field features, such as the depth of the temperature stratification in the sump and the velocity of the metal in the thermal boundary layer close to the solidification front, have been calculated. The results broadly agree with recent full numerical calculations of the flow in the sump. The variation of these essential flow features has been investigated across a range of typical ingot sizes, casting speeds, and superheats, and critical macro-casting-parameter combinations have been identified. The limitations of the model are discussed and the possible effects the identified structure has on macrosegregation are briefly explored. Finally, the influence on the flow field of the method of feeding the ingot is investigated, and it is concluded that the model and these results are not invalidated if the feeding is nonuniform over the top surface of the sump.
LanguageEnglish
Pages491-499
JournalMetallurgical and Materials Transactions B
Volume28
Issue number3
DOIs
Publication statusPublished - 1 Jun 1997

Fingerprint

Aluminum castings
Liquid metals
Casting
ingots
Ingots
aluminum
Flow fields
flow distribution
metals
thermal boundary layer
stratification
Aluminum
solidification
Macros
Solidification
Analytical models
Boundary layers
Metals
scaling
Liquids

Cite this

@article{a47c992a762a46b4b191a5b1cf659884,
title = "Characterisation of the flow in the molten metal sump during direct chill aluminium casting",
abstract = "A recent analytical model for the liquid aluminum flow in a direct chill (DC) casting sump has been investigated and the scaling coefficients evaluated. The magnitudes of flow-field features, such as the depth of the temperature stratification in the sump and the velocity of the metal in the thermal boundary layer close to the solidification front, have been calculated. The results broadly agree with recent full numerical calculations of the flow in the sump. The variation of these essential flow features has been investigated across a range of typical ingot sizes, casting speeds, and superheats, and critical macro-casting-parameter combinations have been identified. The limitations of the model are discussed and the possible effects the identified structure has on macrosegregation are briefly explored. Finally, the influence on the flow field of the method of feeding the ingot is investigated, and it is concluded that the model and these results are not invalidated if the feeding is nonuniform over the top surface of the sump.",
author = "Jason Reese",
year = "1997",
month = "6",
day = "1",
doi = "10.1007/s11663-997-0116-1",
language = "English",
volume = "28",
pages = "491--499",
journal = "Metallurgical and Materials Transactions B",
issn = "1073-5615",
number = "3",

}

Characterisation of the flow in the molten metal sump during direct chill aluminium casting. / Reese, Jason.

In: Metallurgical and Materials Transactions B, Vol. 28, No. 3, 01.06.1997, p. 491-499.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characterisation of the flow in the molten metal sump during direct chill aluminium casting

AU - Reese, Jason

PY - 1997/6/1

Y1 - 1997/6/1

N2 - A recent analytical model for the liquid aluminum flow in a direct chill (DC) casting sump has been investigated and the scaling coefficients evaluated. The magnitudes of flow-field features, such as the depth of the temperature stratification in the sump and the velocity of the metal in the thermal boundary layer close to the solidification front, have been calculated. The results broadly agree with recent full numerical calculations of the flow in the sump. The variation of these essential flow features has been investigated across a range of typical ingot sizes, casting speeds, and superheats, and critical macro-casting-parameter combinations have been identified. The limitations of the model are discussed and the possible effects the identified structure has on macrosegregation are briefly explored. Finally, the influence on the flow field of the method of feeding the ingot is investigated, and it is concluded that the model and these results are not invalidated if the feeding is nonuniform over the top surface of the sump.

AB - A recent analytical model for the liquid aluminum flow in a direct chill (DC) casting sump has been investigated and the scaling coefficients evaluated. The magnitudes of flow-field features, such as the depth of the temperature stratification in the sump and the velocity of the metal in the thermal boundary layer close to the solidification front, have been calculated. The results broadly agree with recent full numerical calculations of the flow in the sump. The variation of these essential flow features has been investigated across a range of typical ingot sizes, casting speeds, and superheats, and critical macro-casting-parameter combinations have been identified. The limitations of the model are discussed and the possible effects the identified structure has on macrosegregation are briefly explored. Finally, the influence on the flow field of the method of feeding the ingot is investigated, and it is concluded that the model and these results are not invalidated if the feeding is nonuniform over the top surface of the sump.

UR - http://www.springerlink.com/content/b7254521k66511q5/fulltext.pdf

U2 - 10.1007/s11663-997-0116-1

DO - 10.1007/s11663-997-0116-1

M3 - Article

VL - 28

SP - 491

EP - 499

JO - Metallurgical and Materials Transactions B

T2 - Metallurgical and Materials Transactions B

JF - Metallurgical and Materials Transactions B

SN - 1073-5615

IS - 3

ER -