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Swirl flow post-CHF heat transfer with refrigerant 113

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Abstract

Heat transfer rate was experimentally determined in the post-CHF region of a steady-state two-phase flow of a refrigerant in a vertical tube with swirl induced by twisted-tape inserts. Experiments were performed with the vertical flow of refrigerant-113 in a tube with inside diameter of 7.75 mm, a heated length of 3.66 m and mass flux of 375–535 kg/m2s for swirl flow at a pressure of 0.184 MPa. Four tapes were used with twist-ratio of 2.5 to 9.2 for swirl flow. Liquid heating produced the low wall-superheat in the post-CHF region at steady-state, which is typical of heat exchanger operation. Superheated vapor measured at the test section exit in most tests ensured that entire post-CHF region was included. All refrigerant-113 data were compared with the data of water and refrigerant-12. The existing post-CHF heat transfer correlation of swirl flow was modified to predict the magnitude and trends of the data of the three fluids such as water, R-12 and R-113.

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Abbreviations

Bo:

Boiling number

CHF:

Critical heat flux

cp :

Specific heat

D:

Diameter

DAS:

Data Acquistion system

F:

F Factor

f:

Fanning friction factor

G:

Mass velocity

g:

Acceleration of gravity

h:

Heat transfer coefficient

i1v :

Latent heat of vaporization

k:

Thermal conductivity

L:

Length

m:

Mass flow rate

Nu:

Nusselt number

P:

180° twist pitch

Pr:

Prandtl number

q":

Heat flux at tube inside surface

Re:

Reynolds number

T:

Temperature

X:

Quality

Y:

Twist ratio P/D

Z:

Axial distance along the test section

β:

Volmetric coefficient of expansion

μ:

Viscosity

ρ:

Density

Φ:

Fraction of tube surface area for wall to drop heat transfer

a:

Actual or axial

b:

Bulk

b,R-113:

Bulk condition of R-113

CHF:

Critical heat flux

H:

Hydraulic

h:

Heating liquid

i:

Inner

l:

Liquid

lv:

Difference between saturated liquid and vapor

MOD:

Modified

o:

Outer

s:

Shell

sat:

Saturated

v:

Vapor

v, a:

Vapor condition evaluated at axial condition

v, s:

Vapor condition based on swirl condition

w:

Wall

wi:

Inner wall

wo:

Outer wall

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Authors and Affiliations

  1. Yong-In Technical College, 449-890 Yong-In gun Yong-In up Mapyung Ri, 77-1, Kyung Ki Do, South Korea

    Seok-Jae Yoo

  2. Department of Mechanical Engineering (M/C 251), The University of Illinois at Chicago, P. O. Box 4348, 60680, Chicago, Illinois, USA

    D. M. France

Authors
  1. Seok-Jae Yoo
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  2. D. M. France
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Yoo, SJ., France, D.M. Swirl flow post-CHF heat transfer with refrigerant 113. KSME Journal 10, 372–382 (1996). https://doi.org/10.1007/BF02942646

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