Research on the generation of the bubble and the bubble pump characteristics of different diameters

In this paper, the effect of the 9.5-6.5 mm different-diameter bubble pump and the 9.5-9.5 mm same-diameter bubble pump on the performance of lithium bromide absorption refrigeration system was experimentally investigated. The contact angle formula was obtained by theoretical derivation. The experimental data showed that: (1) bubble was generated from the core of vaporization in the generator and kept changing its shape from oval to flat until disengagement and (2) the cooling capacity of the former was greater under the same condition, which meant that a secondary lifting pipe with a smaller diameter acted better with the same primary diameter. The increment in cooling capacity was 100-200 W and COP increment was 0.1 under this experimental condition.