title   
  

Two-phase pressure drop across a hydrofoil-based micro-pin device using r-123

Kosar, Ali (2008) Two-phase pressure drop across a hydrofoil-based micro-pin device using r-123. (Accepted/In Press)

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Abstract

The two-phase pressure drop in a hydrofoil-based micro pin fin heat sink has been investigated using R-123 as the working fluid. Two-phase frictional multipliers have been obtained over mass fluxes from 976 to 2349 kg/m2s and liquid and gas superficial velocities from 0.38 to 1.89 m/s and from 0.19 to 24 m/s, respectively. It has been found that the two-phase frictional multiplier is strongly dependent on flow pattern. The theoretical prediction using Martinelli parameter based on the laminar fluid and laminar gas flow represented the experimental data fairly well for the spray-annular flow. For the bubbly and wavy-intermittent flow, however, large deviations from the experimental data were recorded. The Martinelli parameter was used successfully to determine the flow patterns, which were bubbly, wavy-intermittent, and spray-annular flow in the current study. Keywords: Pin fin; Microchannels; Two-Phase Pressure Drop; Flow Pattern; Hydrofoil

Item Type:Article
Subjects:T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
ID Code:5407
Deposited By:Ali Koşar
Deposited On:15 Feb 2008 11:50
Last Modified:22 Oct 2008 09:15

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