Open AccessEXPERIMENTAL ANALYSIS OF PRESSURE DROP IN SINGLE AND TWO PHASE IN MINI CHANNELS
Author(s) -
Jéferson Diehl de Oliveira,
Jacqueline Biancon Copetti,
I. C. Dias,
Mário Henrique Macagnan
Publication year - 2014
Publication title -
engenharia térmica
Language(s) - English
Resource type - Journals
ISSN - 1676-1790
DOI - 10.5380/reterm.v13i1.62071
Subject(s) - pressure drop , vapor quality , refrigeration , isobutane , refrigerant , materials science , boiling point , boiling , mechanics , thermodynamics , body orifice , drop (telecommunication) , chemistry , heat exchanger , mechanical engineering , physics , engineering , biochemistry , catalysis
Evaporators with mini and micro channels are one of the main focuses in the design and development of equipment applied to compact refrigeration systems. The objective of this work is to investigate pressure drop of natural refrigerant, isobutane (R-600a), in the single-phase flow through two small tubes, with 1.0 mm and 2.6 mm of internal diameter. Also, the pressure drop was analyzed in the boiling flow in a 2.6 mm internal diameter tube. The experimental tests included mass velocities of 188, 240, 280 and 370 kg/(m²s), heat fluxes in the range from 0 to 134 kW/m² and boiling flow the saturation temperature of 22 ºC and vapor quality up to 0.8. It was possible to observe the significant influence of the diameter and mass velocity on the total pressure drop and the frictional pressure drop, respectively. The experimental frictional pressure drop in flow boiling in 2.6 mm of internal diameter was compared with four different correlations in literature.