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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EFFECT OF ICE SHEDDING ON HEAT TRANSFER CHARACTERISTICS OF ELECTROTHERMAL DEICING PROCESS

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpf.022048
pages 6657-6664

Abstract

The ice shedding is an important phenomenon during aircraft electrothermal deicing process. The effect of ice shedding on heat transfer characteristics for aircraft deicing is studied. The Enthalpy-Porous Medium model is applied to the numerical simulation by using finite volume method. The computational domain is treated as a porous medium. The temperature is obtained by iteration of the energy equation coupled with the liquid volume fraction. The properties such as thermal conductivity of the mushy zone can be obtained by linear interpolation. The energy equation and the momentum equations are discretized by second-order scheme for accuracy. The separation method is adopted and the sub-relaxation technique is implemented. The SIMPLE algorithm is used for pressure-velocity coupling. The phase change heat transfer characteristics are studied systematically for deicer pad including ice shedding process. The study emphasizes on the effects of heating mode and heater gap on the heat transfer characteristics during electrothermal deicing process. The ice shedding will lead to heat transfer imbalance between heat generation and convection with external flow, which can determine the temperature history of ice-shield interface. The temperature history of ice-shield interface will be same before ice shedding. For one dimensional deicer pad, after ice shedding the shield surface temperature is orginally much higher and then the shield surface temperature rise becomes gradually lower. For two dimensional deicer pad, the temperature history appears more variable and different after ice shedding. The existence of heater gap has a larger contribution on temperature variation compared with one dimensional deicer pad. In essence, the heater gap makes the phase change of ice at cold point become much longer which does not happen for one dimensional deicer pad. Combined with ice shedding and heater gap existence, the temperature history will become much more variable after ice shedding. And the temperature history becomes appropriate flat when the heater gap increases and the temperature can appear a trend of decline finally.