Experimental study of downward facing boiling on a structured hemispherical surface

Effect of grooves on nucleate boiling heat transfer from downward facing hemispherical surface

“…1, a heating system with the liquid metal as the intermediate heat medium in the scaled vessel was used to investigate the boiling heat transfer and CHF on a 3D downward facing grooved surface. The experimental system was the same with Zhong et al (2018b). The liquid metal acted as the intermediate heat medium, and was heated by the heaters and flowed in the internal vessel circularly.…”

“…Various methods have been proposed for enhancing ERVC performance, including using structured surface, nanofluids (Pham et al, 2012;Angayarkanni and Philip, 2015) and thermal insulation (Yang et al, 2005;Noh and Suh, 2013). The structured surfaces include porous coating (Yang et al, 2006;Jun et al, 2016;Tetreault-Friend et al, 2016;Sohag et al, 2017;Wang et al, 2018), pin fins (Chu et al, 2013;Zhong et al, 2015), micro channels (Bai et al, 2016;Hou et al, 2017;Zhong et al, 2018aZhong et al, , 2018b, honeycomb porous plates (Mt Aznam et al, 2016;Fogaça et al, 2018), and spherical porous bodies (Mori et al, 2018), and so on. Yang et al (2006) fabricated a downward facing hemispherical surface with micro-porous coatings by sintering, while Sohag et al (2017) developed a Cold Spray technique to coat the same scale surface, both the coating surfaces were tested in the SBLB (Sub-scaled Boundary Layer Boiling) facility to investigate the CHF.…”

“…Nanoporous hydrophilic surface (Tetreault-Friend et al, 2016) and micro nano bi-porous copper surface (Wang et al, 2018) could also enhance the CHF and boiling heat transfer coefficient significantly, while the reliability is a huge challenge for ERVC. Therefore, the pin fin surfaces (Chu et al, 2013;Zhong et al, 2015) and micro channels surfaces (Bai et al, 2016;Hou et al, 2017;Zhong et al, 2018aZhong et al, , 2018b were developed to improve the performance of ERVC. Hou et al (2017) investigated the CHF of a hypervapotron structure surface under natural circulation conditions in TESEC facility.…”

“…They concluded that the CHF enhancement by HPP and nanoparticle deposition was the role of capillary action. Zhong et al (2018aZhong et al ( , 2018b have developed a structured surface with interconnected-grooves surface and triangular array cavities (IGTAC) to enhance the CHF in saturated water, and the experiments on flat surface and 3D hemispherical surface were conducted. Zhong et al (2018a) investigated the boiling performance of IGTAC surface by using the flat surface experimental apparatus, and more than 117% CHF enhancement was obtained on the optimized flat IGTAC surface.…”

“…Zhong et al (2018a) investigated the boiling performance of IGTAC surface by using the flat surface experimental apparatus, and more than 117% CHF enhancement was obtained on the optimized flat IGTAC surface. In order to obtain the boiling performance of IGTAC surface on hemispherical vessel, Zhong et al (2018b) investigated the boiling heat transfer of IGTAC surface on a scaled hemispherical vessel. However, compared with the 3D hemispherical plain surface, only more than 59% heat flux increase was obtained on 3D IGTAC surface.…”