Heat Transfer by Liquids in Suspension in a Turbulent Gas Stream; TRANSFERT DE CHALEUR PAR LIQUIDES ENTRAINES DANS UN ECOULEMENT GAZEUX TURBULENT
The introduction of a small volume of liquid into a turbulent gas stream used as cooling agent considerably improves the heat-transfer coefficient of the gas. When the turbulent regime is established in a cylindrical tube, two types of flow are observed, depending on whether the liquid wets or does not wet the wall. In the first case, an anular liquid film on the wall and droplets in suspension in the gas stream are formed. In the second case, a fog of droplets is formed without any liquid film on the wall. experiments were performed with the following mixtures: water -- hydrogen, water -- nitrogen, ethanol-- nitrogen (wetting liquids) introduced into a stainless-steel tube of 4-mm ID, electrically heated on 320 mm of the length. The gas flow rate (Reynolds number to 50,000), the ratio of liquidflow rats to gas flow rate (to 15), the pressure (to 10 kg/ cm/ sup 2/), the temperature (to the boiling point) and the heat flux (to 250 w/cm/ sup 2/) were varied, (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique. Centre d'Etudes Nucleaires, Saclay
- NSA Number:
- NSA-15-002731
- OSTI ID:
- 4122082
- Report Number(s):
- CEA-1422
- Country of Publication:
- France
- Language:
- English
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