Effect of diameter on two-phase pressure drop in narrow tubes

Venkatesan, M.; Das, Sarit K.; Balakrishnan, A.

doi:10.1016/j.expthermflusci.2010.12.007

Cited by 39 publications

(19 citation statements)

References 23 publications

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“…The pressure drop of the two-phase gas/liquid flow is a complex problem, affected by many factors including the flow rate, the passage geometry and the two-phase flow pattern2728. In the experimental study of homogeneous gas/liquid flows in square micro channels, Cubaud29 reported that inducing the gas phase could lead to a larger pressure drop.…”

Section: Discussionmentioning

confidence: 99%

The Adhesive System and Anisotropic Shear Force of Guizhou Gastromyzontidae

Zou

Wang

Chen

2016

Sci Rep

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The Guizhou gastromyzontidae (Beaufortia kweichowensis) can adhere to slippery and fouled surfaces in torrential streams. A unique adhesive system utilized by the fish was observed by microscope and CLSM as an attachment disc sealed by a round belt of micro bubbles. The system is effective in wet or underwater environments and can resist a normal pulling force up to 1000 times the fish’s weight. Moreover, a mechanism for passive anisotropic shear force was observed. The shear forces of the fish under different conditions were measured, showing that passive shear force plays an important role in wet environments. The adhesive system of the fish was compared with other biological adhesion principles, from which we obtained potential values for the system that refer to the unique micro sealing and enhanced adhesion in a wet environment.

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Section: Discussionmentioning

confidence: 99%

The Adhesive System and Anisotropic Shear Force of Guizhou Gastromyzontidae

Zou

Wang

Chen

2016

Sci Rep

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“…Hence, pressure drop estimation for two‐phase flow in a minichannel is a very important step in the design of process control systems. A step towards a better estimation of pressure drop includes understanding the flow regimes, which in turn are affected by several factors like inertia, gravity, viscous shear, and surface tension (Li and Wu, Venkatesan et al). Two‐phase flows in single channels were analyzed in the past to get different flow maps (Venkatesan et al, Wambsganss et al, Spedding and Spence, and Tripplet et al).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on two‐phase flow maldistribution in parallel minichannels with U‐type configuration

Madanan¹,

Nayak²,

Chatterjee³

et al. 2018

Can J Chem Eng

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Two-phase flow in parallel minichannels finds a number of applications. Maldistribution between parallel channels reduces both the thermal and fluid-dynamic performances. To reduce the maldistribution effect, it is important to have information about the phase split in individual channels. The present study brings out the effects of various parameters like the channel diameter, number of channels, two-phase flow regimes, and void fraction on the flow split in two-phase flow inside a system of parallel channels for a U-type configuration. Experiments are carried out with the plug and slug regimes typical to minichannel flows. High speed photography is used for flow visualization and the pressure drop values in individual channels are measured with a differential pressure transmitter to quantify maldistribution. The time averaged void fraction is found using an image processing technique. A counterintuitive non-monotonous distribution of the void fraction in the channels brings out the fact that in two-phase flow splitting, the relative distribution of the two phases does not depend on pressure drop alone. Flow configuration and the two-phase flow regime in the header play a key role. An analysis with the existing separated flow model modified for minichannels reveals that although it is possible to estimate the orders of magnitude with respect to splitting, better splitting models still need to be developed. An empirical correlation for variation of the normalized pressure drop in the parallel minichannels, as a function of dimensionless distance along the header, is developed for each of the investigated flow regimes.

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“…Undoubtedly, knowing the flow patterns is necessary for designing a thermal engineering system, because the flow patterns affect the system's pressure loss and heat transfer rate. A considerable number of studies about two-phase liquid-gas flow in pipes have been performed [2][3][4][5][6][7]. However, there are relatively few studies about two-phase flow in an annulus.…”

Section: Introductionmentioning

confidence: 99%