Experimental Study of Aqueous Ammonium Chloride in Pool Boiling Heat Transfer

Abstract

Saturated nucleate boiling of aqueous ammonium chloride on a nichrome wire heater has been experimentally investigated. The boiling performance is enhanced by using of ammonium chloride as an additive. The maximum level of enhancement is observed up to 2,600 ppm concentration of additive. For concentrations more than 2600 ppm, significant enhancement is not recorded. Enhancement observed is due to the change in the thermo-physical properties of the aqueous solution. It is observed that as ammonium chloride is added to distilled water, the surface tension of the mixture considerably reduces. The experiment is carried out above critical heat flux to observe the behavior of boiling at higher heat flux.

Keywords:

• additive
• pool boiling
• surface tension
• experimental
• enhancement