Pressure drop characteristics for two-phase flow of FC-72 in microchannel

Abstract

In this paper, an experimental study on two-phase flow pressure drop of refrigerant FC-72 is carried out in a microchannel. The microchannel has a width and depth of 0.45 and 0.2 mm respectively, and comprises 15 parallel channels with a length of 60 mm. The experiment is conducted under the condition of mass flux of 100.3–458.0 kg/m2s and heat flux of 3.2–49.0 kW/m2. This study analyzed the pressure drop characteristics for two-phase flow by using a separated flow model. To predict the frictional pressure drop, two-phase frictional multiplier obtained from experiments is compared with the existing correlations. The experimental results show that two-phase frictional multipliers rely heavily on the vapor quality. Fractional pressure drop increases as the vapor quality increases. However, the rate of increase in the high vapor quality region decreases as the vapor quality increases. Based on pressure drop characteristics obtained from the experiments, a new correlation is proposed to predict the frictional pressure drop. Two-phase multiplier is modified with the dimensionless parameters such as Reynolds number, Weber number, and Martinelli parameter. The newly developed correlation predicts the experimental results well within a mean absolute error of 8.0%.

Experimental Investigation and Prediction on Pressure Drop during Flow Boiling in Horizontal Microchannels

“…It indicates that the two-phase frictional multiplier is related to the vapor quality. As the vapor quality increases, the two-phase frictional multiplier increases almost linearly, which quite agrees with Choi et al [ 27 ]. However, the mass velocity has little effect on the two-phase frictional multiplier.…”

“…Figure 8 compares the present pressure drop data to predictions based on six aforementioned correlations. Figure 7 and Figure 8 both show that most correlations overpredicted the two-phase frictional multiplier compared with the experimental results, while the correlation of Choi et al [ 27 ] underpredicted slightly. Among these correlations, the correlation of Choi et al [ 27 ] predicted most accurately.…”

“…They found that the two-phase multiplier decreases with the increase of mass velocity, and a new correlation model based on the Chisholm parameter was proposed as a function of the two-phase Reynolds and Weber numbers. Later, Choi et al [ 27 ] carried out an experimental study on the boiling pressure drop using FC-72 as the working fluid in 15 parallel channels with a length of 60 mm and size of 0.45 mm × 0.2 mm. They found that the two-phase frictional multiplier largely depends on the vapor quality, and the frictional pressure drop increases as the vapor quality increases.…”

Study of the pressure drop in dust scrubber affected by liquid flowability

“…Research has shown that the results of gas-liquid two-phase studies can help significantly improve scrubber performance and ease the facility upsizing process. 14,15…”

“…Research has shown that the results of gas-liquid two-phase studies can help significantly improve scrubber performance and ease the facility upsizing process. 14,15 Additionally, studying the pressure drop will contribute to a better understanding of the energy consumption of dust scrubbers. Because the self-excited dust scrubber is a differential pressure (throttling) device, the primary portion of the energy (pressure drop) is consumed during the throttling process at the choke.…”