Experimental Study of Heat Transfer Enhancement in Pool Boiling by Using 2-Ethyl 1-Hexanol an Additive

Abstract

The addition of additives to the water is known to enhance boiling heat transfer. In the present investigation, boiling heat transfer coefficients are measured for Nichrome wire, immersed in saturated water with & without additive. An additive used is 2-Ethyl 1-Hexanol with varying concentrations in the range of 10-10000 ppm. Extensive experimentation of pool boiling is carried out above the critical heat flux. Boiling behavior i.e. bubble dynamics are observed at higher heat flux for nucleate boiling of water over wide ranges of concentration of additive in water. Results are encouraging and show that a small amount of surface active additive makes the nucleate boiling heat transfer coefficient considerably higher, and that there is an optimum additive (500-1000ppm) concentration for higher heat fluxes. An optimum level of enhancement is observed up to a certain amount of additive 500-1000ppm in the tested range. Thereafter significant enhancement is not observed. This enhancement may be due to change in thermo-physical properties i.e. mainly due to a reduction in surface tension of water in the presence of additive.

Heat Transfer Enhancement in Separation Process of Ethanol from Ethanol Water Mixture by Using Surfactants

“…Gajghate S.S. et al [11] work showed that a small amount of 2 ethyl 1 hexanol additive makes the nucleate boiling heat transfer coefficient considerably much higher and that there was an optimum additive (500-1000 ppm) concentration for higher heat fluxes. A most appropriate level of enhancement was observed up to a certain amount of additive 500-1000 ppm in the tested range.…”

Effect of Uniformly and Nonuniformly Coated Al2O3 Nanoparticles over Glass Tube Heater on Pool Boiling

“…Surfactant additive changes the boiling phenomenon drastically. The addition of very small amounts of surfactant additive in water can enhance nucleate boiling heat transfer remarkably with nichrome wire as plain heater [1][2][3][4][5]. Das et al [6] investigated pool boiling in water -Al 2 O 3 Nanofluid on rectangular stainless steel vessel experimentally.…”

Research progresses and future directions on pool boiling heat transfer

“…The effect of surface roughness on nucleate boiling heat transfer was studied [46]. Boiling performance of aqueous ammonium chloride as an additive using a nichrome wire heater was experimentally studied [47]. The nucleate boiling heat transfer of gas saturated FC-72 on micro pin finned surface under microgravity was investigated [48].…”