Publication detail

Heat Transfer Coefficient at Cast-Mold Interface During Centrifugal Casting: Calculation of Air Gap

BOHÁČEK, J. KHARICHA, A. LUDWIG, A. WU, M. KARIMI-SIBAKI, E.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

During centrifugal casting, the thermal resistance at the cast-mold interface represents a main blockage mechanism for heat transfer. In addition to the refractory coating, an air gap begins to form due to the shrinkage of the casting and the mold expansion, under the continuous influence of strong centrifugal forces. Here, the heat transfer coefficient at the cast-mold interface h has been determined from calculations of the air gap thickness d (a) based on a plane stress model taking into account thermoelastic stresses, centrifugal forces, plastic deformations, and a temperature-dependent Young's modulus. The numerical approach proposed here is rather novel and tries to offer an alternative to the empirical formulas usually used in numerical simulations for a description of a time-dependent heat transfer coefficient h. Several numerical tests were performed for different coating thicknesses d(C), rotation rates Omega, and temperatures of solidus T-sol. Results demonstrated that the scenario at the interface is unique for each set of parameters, hindering the possibility of employing empirical formulas without a preceding experiment being performed. Initial values of h are simply equivalent to the ratio of the coating thermal conductivity and its thickness (similar to 1000 Wm(-2) K-1). Later, when the air gap is formed, h drops exponentially to values at least one order of magnitude smaller (similar to 100 Wm(-2) K-1). (C) The Author(s) 2018. This article is an open access publication

Keywords

METAL-MATRIX COMPOSITES; NUMERICAL-SIMULATION; MACROSTRUCTURE FORMATION; SOLIDIFICATION ANALYSIS; SURFACE-ROUGHNESS; CYLINDER; MODEL; AL; SEGREGATION; TEMPERATURE

Authors

BOHÁČEK, J.; KHARICHA, A.; LUDWIG, A.; WU, M.; KARIMI-SIBAKI, E.

Released

1. 7. 2018

Publisher

SPRINGER

Location

NEW YORK

ISBN

1073-5615

Periodical

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE

Year of study

Number

State

United States of America

Pages from

1421

Pages to

1433

Pages count

URL

http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=D1mYtjVweLYpwOM65oz&page=1&doc=1

BibTex

@article{BUT164741,
  author="BOHÁČEK, J. and KHARICHA, A. and LUDWIG, A. and WU, M. and KARIMI-SIBAKI, E.",
  title="Heat Transfer Coefficient at Cast-Mold Interface During Centrifugal Casting: Calculation of Air Gap",
  journal="METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE",
  year="2018",
  volume="49",
  number="3",
  pages="1421--1433",
  doi="10.1007/s11663-018-1220-0",
  issn="1073-5615",
  url="http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=D1mYtjVweLYpwOM65oz&page=1&doc=1"
}