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Thermal exchanges: heat transfer - burn-out - fouling; Echanges thermiques: transfert de chaleur - brulage - encrassement

Conference:

Abstract

Under a contract with the department responsible for EURATOM's ORGEL project, the authors have investigated heat-transfer characteristics, the way in which they are affected by dissolved gases, burn-out and the effect of fouling of the cooling system walls. Heat transfer. Using a circular channel 12 mm in diameter, a single-phase heat-transfer correlation was obtained for OM2, OMP and OM2 plus 10, 20 and 30% HB; Nu = 0.00835 Re{sup 0.9} Pr{sup 0.4} for fluxes between 50 and 100 W/cm{sup 2} and Reynolds numbers between 30,000 and 350,000. The authors studied the way in which heat transfer under boiling conditions is affected by dissolved gases in both free convection and forced convection in annular geometry (18 mm x 22 mm). The occurrence of de gasification, which results in a substantial increase in the transfer coefficient, is governed by the saturation temperature of the gasified fluid. A theoretical method was established for determining the threshold for this phenomenon. At the same time it was shown that charge losses were not affected by the gas content in the de gasification zone. Burn-out. In annular geometry (18 mm x 22 mm) the following correlation was obtained: {phi}BO(W/cm{sup 2}) = 10+19 G{sup 1/2} + (10  More>>
Authors:
Courtaud, M; Ricque, R [1] 
  1. Service des Transferts Thermiques, Centre d'Etudes Nucleaires de Grenoble (ISERE) (France)
Publication Date:
Jan 01, 1967
Product Type:
Conference
Report Number:
PL-194/2
Resource Relation:
Conference: Panel on the use of organic liquids as reactor coolants and moderators, Vienna (Austria), 9-13 May 1966; Other Information: PBD: Jan 1967; Related Information: In: Organic liquids as reactor coolants and moderators, Technical reports seriesno. 70, 154 pages.
Subject:
42 ENGINEERING; BOILING; BURNOUT; DISSOLVED GASES; FLOW RATE; FORCED CONVECTION; FOULING; HEAT TRANSFER; NATURAL CONVECTION; POLYPHENYLS; TERPHENYLS; THERMODYNAMIC PROPERTIES
OSTI ID:
20385686
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
French
Other Identifying Numbers:
TRN: XA0301980065199
Submitting Site:
INIS
Size:
page(s) 134-135
Announcement Date:

Conference:

Citation Formats

Courtaud, M, and Ricque, R. Thermal exchanges: heat transfer - burn-out - fouling; Echanges thermiques: transfert de chaleur - brulage - encrassement. IAEA: N. p., 1967. Web.
Courtaud, M, & Ricque, R. Thermal exchanges: heat transfer - burn-out - fouling; Echanges thermiques: transfert de chaleur - brulage - encrassement. IAEA.
Courtaud, M, and Ricque, R. 1967. "Thermal exchanges: heat transfer - burn-out - fouling; Echanges thermiques: transfert de chaleur - brulage - encrassement." IAEA.
@misc{etde_20385686,
title = {Thermal exchanges: heat transfer - burn-out - fouling; Echanges thermiques: transfert de chaleur - brulage - encrassement}
author = {Courtaud, M, and Ricque, R}
abstractNote = {Under a contract with the department responsible for EURATOM's ORGEL project, the authors have investigated heat-transfer characteristics, the way in which they are affected by dissolved gases, burn-out and the effect of fouling of the cooling system walls. Heat transfer. Using a circular channel 12 mm in diameter, a single-phase heat-transfer correlation was obtained for OM2, OMP and OM2 plus 10, 20 and 30% HB; Nu = 0.00835 Re{sup 0.9} Pr{sup 0.4} for fluxes between 50 and 100 W/cm{sup 2} and Reynolds numbers between 30,000 and 350,000. The authors studied the way in which heat transfer under boiling conditions is affected by dissolved gases in both free convection and forced convection in annular geometry (18 mm x 22 mm). The occurrence of de gasification, which results in a substantial increase in the transfer coefficient, is governed by the saturation temperature of the gasified fluid. A theoretical method was established for determining the threshold for this phenomenon. At the same time it was shown that charge losses were not affected by the gas content in the de gasification zone. Burn-out. In annular geometry (18 mm x 22 mm) the following correlation was obtained: {phi}BO(W/cm{sup 2}) = 10+19 G{sup 1/2} + (10 + 15 G) {delta} T{sub sub} / 25 (G in 10{sup 3} kg/m{sup 2} s); 5 kg/cm{sup 2} < P < 8 kg/cm{sup 2} 350 deg. C < T{sub fluid} < 400 deg. C; 4 m/s < V < 10 m/s. The dissolved gases have no effect on burn-out. Fouling. The way in which a number of factors affect the fouling of the walls of an annular test section (12 mm x 16 mm) was studied in an out-of-pile loop during tests lasting on average 500 h, as a function of the effect of fouling on the heat-transfer coefficient. The following impurities were added to the basic product, which was commercial-grade OM2: iron (from a ferrous element, which had therefore been introduced into the circuit), high-polymer pyrolysis products (up to 30%), chlorine (30 ppm) and oxygen (300 ppm in the form of anthraquinone). The flow rate was either 3 or 8 m/s, the temperature of the fluid 380 deg. C and the initial wall temperature 480 or 505 deg. C. Considerable fouling could be observed as a result of the presence of chlorine, the presence of oxygen and high wall temperatures. (author)}
place = {IAEA}
year = {1967}
month = {Jan}
}