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Date of Publication:2017-01-01

Journal:核动力工程

Volume:38

Issue:2

Page Number:24-27

ISSN No.:0258-0926

Abstract:Experimental investigation on the heat transfer and flow of
   supercritical pressure water flowing in the sub-channel of SCWR, which
   was simulated by a vertical triangular channel, was conducted at the
   pressures of 23~28 MPa, mass fluxes of 700~1300 kg/(m~2·s) and heat
   fluxes on the inner wall surface of 200~800 kW/m~2. The corresponding
   diameter of the fuel rod is 8mm and the ratio of pitch to diameter is
   1.4. The effects of heat flux, pressure and mass velocity on the heat
   transfer characteristics were analyzed. Experimental results showed that
   the wall temperature increases and the peak of heat transfer coefficient
   decreases with the increasing of the heat flux and pressure when other
   parameters remain unchanged. Improvement of mass velocity can enhance
   the heat transfer, which is characterized by the lower wall temperature
   and higher heat transfer coefficient. However the intensify effect of
   mass velocity on the heat transfer performance is not obvious when it
   reaches a certain level. The wall temperature varies dramatically with
   the increasing of the enthalpy and the peak heat transfer coefficient is
   much lower than that of the lower heat flux when the heat flux reaches
   800 kW/m~2. And the enhanced heat transfer that usually appears in the
   large specific heat region is greatly weakened when the pressure rises
   up to 28 MPa.

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