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Graphite suspension in carbon dioxide; Suspension de graphite dans le gaz carbonique

Abstract

Since 1963 the Atomic Division of SNECMA has been conducting, under a contract with the CEA, an experimental work with a two-component fluid comprised of carbon dioxide and small graphite particles. The primary purpose was the determination of basic engineering information pertaining to the stability and the flowability of the suspension. The final form of the experimental loop consists mainly of the following items: a light-phase compressor, a heavy-phase pump, an electrical-resistance type heater section, a cooling heat exchanger, a hairpin loop, a transparent test section and a separator. During the course of the testing, it was observed that the fluid could be circulated quite easily in a broad range of variation of the suspension density and velocity - density from 30 to 170 kg/m{sup 3} and velocity from 2 to 24 m/s. The system could be restarted and circulation maintained without any difficulty, even with the heavy-phase pump alone. The graphite did not have a tendency to pack or agglomerate during operation. No graphite deposition was observed on the wall of the tubing. A long period run (250 hours) has shown the evolution of the particle dimensions. Starting with graphite of surface area around 20 m{sup 2}/g (graphite particles  More>>
Authors:
Roche, R; [1]  Moussez, C; Rouvillois, X; Brevet, R [2] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
  2. Societe Nationale d'Etude et de Construction de Moteurs d'Aviation (SNECMA), 75 - Paris (France)
Publication Date:
Jul 01, 1965
Product Type:
Technical Report
Report Number:
CEA-R-2741
Resource Relation:
Other Information: 8 refs
Subject:
42 ENGINEERING; CARBON DIOXIDE; DIFFUSERS; FLOW RATE; GRAPHITE; HEAT TRANSFER FLUIDS; HUMIDITY; PARTICLE SIZE; PIPES; PRESSURE DROP; SPECIFIC SURFACE AREA; SUSPENSIONS; TWO-PHASE FLOW
OSTI ID:
20702688
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2741017813
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
42 pages
Announcement Date:
Apr 07, 2006

Citation Formats

Roche, R, Moussez, C, Rouvillois, X, and Brevet, R. Graphite suspension in carbon dioxide; Suspension de graphite dans le gaz carbonique. France: N. p., 1965. Web.
Roche, R, Moussez, C, Rouvillois, X, & Brevet, R. Graphite suspension in carbon dioxide; Suspension de graphite dans le gaz carbonique. France.
Roche, R, Moussez, C, Rouvillois, X, and Brevet, R. 1965. "Graphite suspension in carbon dioxide; Suspension de graphite dans le gaz carbonique." France.
@misc{etde_20702688,
title = {Graphite suspension in carbon dioxide; Suspension de graphite dans le gaz carbonique}
author = {Roche, R, Moussez, C, Rouvillois, X, and Brevet, R}
abstractNote = {Since 1963 the Atomic Division of SNECMA has been conducting, under a contract with the CEA, an experimental work with a two-component fluid comprised of carbon dioxide and small graphite particles. The primary purpose was the determination of basic engineering information pertaining to the stability and the flowability of the suspension. The final form of the experimental loop consists mainly of the following items: a light-phase compressor, a heavy-phase pump, an electrical-resistance type heater section, a cooling heat exchanger, a hairpin loop, a transparent test section and a separator. During the course of the testing, it was observed that the fluid could be circulated quite easily in a broad range of variation of the suspension density and velocity - density from 30 to 170 kg/m{sup 3} and velocity from 2 to 24 m/s. The system could be restarted and circulation maintained without any difficulty, even with the heavy-phase pump alone. The graphite did not have a tendency to pack or agglomerate during operation. No graphite deposition was observed on the wall of the tubing. A long period run (250 hours) has shown the evolution of the particle dimensions. Starting with graphite of surface area around 20 m{sup 2}/g (graphite particles about 1 {mu}), the powder surface area reaches an asymptotic value of 300 m{sup 2}/g (all the particles less than 0.3 {mu}). Moisture effect on flow stability, flow distribution between two parallel channels, pressure drop in straight tubes, recompression ratio in diffusers were also investigated. (author) [French] Depuis 1963 la Division Atomique de la SNECMA conduit, dans le cadre d'un contrat avec le Commissariat A l'Energie Atomique, l'etude experimentale d'une suspension de fines particules de graphite dans le gaz carbonique. L'objectif principal est d'obtenir des informations d'ordre mecanique et technologique sur la mise en oeuvre de l'ecoulement de ce fluide diphase. Le circuit experimental comprend principalement: un compresseur, une pompe 'phase lourde', un rechauffeur, un refroidisseur a eau, un tube en U, une section d'essais transparente et un separateur. Le fluide circule tres aisement dans un large domaine de variation de la masse volumique (30 a 170 kg/m{sup 3}) et de la vitesse (2 a 24 m/s). La mise en circulation et la stabilite de l'ecoulement sont assurees sans difficulte, meme avec la pompe 'phase lourde' seule. On n'observe aucune tendance a l'agglomeration ni aucun depot de graphite sur les parois. Un essai d'endurance (250 heures) a permis de suivre l'evolution des particules. La surface specifique de la poudre voisine de 20 m{sup 2}/g au depart (dimension des particules de l'ordre du micron ) atteint une valeur asymptotique de 300 m{sup 2}/g (dimension des particules inferieure a 0,3 micron). On a aussi examine l'effet de l'humidite sur la stabilite de l'ecoulement, la distribution du debit entre des canaux paralleles, les pertes de pression dans un tube rectiligne ainsi que le rapport de recompression dans un divergent. (auteur)}
place = {France}
year = {1965}
month = {Jul}
}