Experimental Investigations on Pressure Drop for Subcooled Water in a Circular Channel with a Twisted Tape Insert under One-Side Heating Conditions

Ge Zhu, Ge Mei, Qincheng Bi and Shujian Tian
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Ge Mei: School of Information Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Qincheng Bi: State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Shujian Tian: School of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China

Energies, 2023, vol. 17, issue 1, 1-19

Abstract: The pressure drop characteristics of subcooled water were experimentally investigated in a circular cooling channel with and without a twisted tape (TT) under high heat fluxes, which was designed for the water-cooling structure of the divertor target in a tokamak device. The working medium was deionized water, and the main parameters were mass flux G = 3000–8000 kg·m −2 ·s −1 , inlet pressure of the test section p = 3, 4.2, 5 MPa, equivalent one-side heating flux q e = 5~10 MW·m −2 . The off-center circular channel is electrically heated to simulate the unilateral radiation heating on the divertor target by high-temperature plasma. The pressure drop experiment of vertical upward circular cooling channels under high and unilateral heat flux is carried out. The influences of the TT and system parameters such as q e , G, and p on the pressure drop of the test section (Δ p ) were discussed in detail. In the single-phase (SP) flow region, Δ p is mainly affected by the TT, G, and q e . The pressure drop with a TT is significantly higher than that without a TT, a higher G and a lower q e lead to a greater Δ p . In the subcooled boiling (SB) flow region, Δ p is correlated with the TT, q e , G , and p : the influence of the TT and G decreases, while the influence of p increases. The higher the q e , the higher the G , and the lower the p , the larger the Δ p . The results show that almost all of the SP pressure drop correlations for heated circular channels overestimate the experimental pressure drop coefficient ratio for a given viscosity ratio. According to the test results, a new correlation of SP pressure drop under high and unilateral heat fluxes has been proposed, the average error (AE) and root mean square error (RMSE) of which are 0.26% and 3.17%, respectively.

Keywords: pressure drop; twisted tape; subcooled flow boiling; one-side heating; high heat flux (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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