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Document IIF

Etude expérimentale sur l'application des vibrations ultrasoniques à un générateur de solution aqueuse de bromure de lithium.

An experimental study on the application of ultrasonic vibrations to a generator of a lithium bromide aqueous solution.

Auteurs : YAMASHIRO H., TAKATA N.

Résumé

The paper presents a study on the effects of ultrasonic vibrations on the heat transfer characteristics of LiBr aqueous solution at low pressures, studied experimentally. Pool boiling curves of a horizontal smooth tube were obtained using distilled water and 50% LiBr aqueous solution as test liquids. The system pressure was varied from 12 to 101 kPa, and the liquid subcooling ranges from 0 to 70 K. The frequency of ultrasonic vibration n was set at 24 and 44 kHz, and the power input to the vibrator P was varied from 0 to 35 W. The wall superheat at boiling incipience was found to decrease with increasing P, and the nucleate boiling curve shifts toward the lower wall temperature region. However, the effect of P was not found to be very significant in the high heat flux region, especially in the case of liquid subcooling. Ultrasonic vibration was found to improve the nucleate boiling heat transfer coefficient by up to a maximum of 3.5 times and to prevent crystallization of the solution and precipitation of the additives.

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Détails

  • Titre original : An experimental study on the application of ultrasonic vibrations to a generator of a lithium bromide aqueous solution.
  • Identifiant de la fiche : 2004-2208
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

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