Experimental Investigation of Critical Heat Flux on Different Surfaces at Low Pressure and Low Flow

Ladislav Suk, Taron Petrosyan, Kamil Stevanka, Daniel Vlcek and Pavel Gejdos
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Ladislav Suk: Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, 61669 Brno, Czech Republic
Taron Petrosyan: Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 3058/10, 61600 Brno, Czech Republic
Kamil Stevanka: Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 3058/10, 61600 Brno, Czech Republic
Daniel Vlcek: Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holesovickach 2, 18000 Prague 8, Czech Republic
Pavel Gejdos: Brno University of Technology, CEITEC-Central European Institute of Technology, Purkynova 656/123, 61200 Brno, Czech Republic

Energies, 2020, vol. 13, issue 19, 1-23

Abstract: Steady state flow boiling experiments were carried out on several heated tubes with outer diameter 9.14 mm at outlet pressures 120, 200 and 300 kPa, inlet temperatures 64, 78 and 91 °C and approximately 400, 500, 600 and 800 kg/(m 2 ·s) mass flux entering the vertically aligned test annulus until critical heat flux (CHF) was reached. The tubes were made of Inconel 625 with a length of 400 mm. The Inconel tubes were tested in three different modifications as smooth, abraded with 150 grit sandpaper and bead blasted. Multiple experiments were repeated on the same specimen to investigate the effect of surface characteristic changes (i.e., wettability, roughness and oxide layer morphology) on the occurrence of CHF. Despite the changes in initial wettability, the CHF dependency was not clearly observed, however, the changes in roughness led to an increase in CHF. The total number of 115 experimental runs were collected and the results were also compared with other literature experimental data.

Keywords: critical heat flux; flow boiling; annulus; Inconel 625; two phase flow; low pressure (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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