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An Experimental Study of Pressure Gradients for Flow of Boiling Water in a Vertical Round Duct. (Part 2)

Abstract

The present report contains the results of the second phase of an experimental investigation concerning frictional pressure gradients for the flow of boiling water in vertical channels. The test section for this phase consisted of an electric heated stainless steel tube of 3120 mm length and 7.76 mm inner diameter. Data were obtained for pressures between 6 and 41 ata, steam qualities between 0 and 70 per cent, flow rates between 0.025 and 0.210 Kg/sec and surface heat flux between 30 and 91 W/cm. The results are in excellent agreement with our earlier data for flow in a 9.93 mm inner diameter ducts which were presented in report AE-69. From the measurements we conclude that in the range investigated the non dimensional pressure gradient ratio, {phi}{sup 2} is independent of mass flow rate, inlet sub-cooling and surface heat flux. On the basis of the measured pressure gradients, the following empirical equation has been established for engineering use, {phi}{sup 2} = 1 + 2400 (x/p){sup 0.96} This equation correlates our data (more than 1000 points) with a discrepancy of less than {+-} 15 per cent.
Publication Date:
Mar 15, 1962
Product Type:
Technical Report
Report Number:
AE-70
Resource Relation:
Other Information: 4 refs., 34 figs.
Subject:
42 ENGINEERING; PRESSURE GRADIENTS; TWO-PHASE FLOW; ACCURACY; PRESSURE DEPENDENCE; STEAM QUALITY; FLOW RATE; INTERNAL FRICTION; FLUID FLOW; WATER; DUCTS
OSTI ID:
20930893
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708311
Availability:
Commercial reproduction prohibited; OSTI as DE20930893
Submitting Site:
SWDN
Size:
36 pages
Announcement Date:
Sep 29, 2007

Citation Formats

Becker, Kurt M, Hernborg, Gunnar, and Bode, Manfred. An Experimental Study of Pressure Gradients for Flow of Boiling Water in a Vertical Round Duct. (Part 2). Sweden: N. p., 1962. Web.
Becker, Kurt M, Hernborg, Gunnar, & Bode, Manfred. An Experimental Study of Pressure Gradients for Flow of Boiling Water in a Vertical Round Duct. (Part 2). Sweden.
Becker, Kurt M, Hernborg, Gunnar, and Bode, Manfred. 1962. "An Experimental Study of Pressure Gradients for Flow of Boiling Water in a Vertical Round Duct. (Part 2)." Sweden.
@misc{etde_20930893,
title = {An Experimental Study of Pressure Gradients for Flow of Boiling Water in a Vertical Round Duct. (Part 2)}
author = {Becker, Kurt M, Hernborg, Gunnar, and Bode, Manfred}
abstractNote = {The present report contains the results of the second phase of an experimental investigation concerning frictional pressure gradients for the flow of boiling water in vertical channels. The test section for this phase consisted of an electric heated stainless steel tube of 3120 mm length and 7.76 mm inner diameter. Data were obtained for pressures between 6 and 41 ata, steam qualities between 0 and 70 per cent, flow rates between 0.025 and 0.210 Kg/sec and surface heat flux between 30 and 91 W/cm. The results are in excellent agreement with our earlier data for flow in a 9.93 mm inner diameter ducts which were presented in report AE-69. From the measurements we conclude that in the range investigated the non dimensional pressure gradient ratio, {phi}{sup 2} is independent of mass flow rate, inlet sub-cooling and surface heat flux. On the basis of the measured pressure gradients, the following empirical equation has been established for engineering use, {phi}{sup 2} = 1 + 2400 (x/p){sup 0.96} This equation correlates our data (more than 1000 points) with a discrepancy of less than {+-} 15 per cent.}
place = {Sweden}
year = {1962}
month = {Mar}
}