Two-phase adiabatic frictional pressure gradients for R410A and CO2 in a macro channel: Experiments and a simplified predictive method for annular flow from low to medium reduced pressures

被引：14

作者：

Grauso, S. ^{[1
]}

Mastrullo, R. ^{[1
]}

Mauro, A. W. ^{[1
]}

Vanoli, G. P. ^{[2
]}

机构：

[1] Univ Naples Federico II, Dept Ind Engn, I-80125 Naples, Italy

[2] Univ Sannio, DING, I-82100 Benevento, Italy

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2014年 / 52卷

关键词：

R410A; R1234; Adiabatic frictional pressure gradients; Reduced pressure; Predictive method; SMOOTH TUBE EXPERIMENTS; BOILING HEAT-TRANSFER; DROP CORRELATION; CARBON-DIOXIDE; PATTERN MAP; EVAPORATION;

D O I：

10.1016/j.expthermflusci.2013.08.024

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The use of refrigerants at evaporating temperatures much higher than those of the refrigeration field is an emerging need in the industry related to energy conversion systems, such as Organic Rankine Cycles and cascade heat pumps for sanitary hot water production. In this work the effect of reduced pressure is experimentally investigated for two-phase adiabatic frictional pressure gradients for CO2 and R410A in a wide range of reduced pressure (0.19-0.52 for R410A and 0.57-0.64 for CO2) and mass flux (150-500 kg rn(-2) s(-1)) in a adiabatic horizontal smooth tube of 6.00 mm of inner diameter, collecting 1214 new data points. A simplified phenomenological method for annular flow was proposed and validated with the present and existing databases by the same authors and independent databases for several fluids (CO2, R410A, R134a and also the new fluid R1234ze(E)). (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：79 / 87

页数：9

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