Effect of Additives on the Foam Behavior of Aviation
Coolants: Tendency, Stability, and Defoaming
Posted on 2020-07-07 - 16:07
The foam tendency
of aviation coolants (ACs) can be greatly influenced
by additives. This study investigates the effect of additives on foam
behaviors based on four commercial ACs and glycol aqueous solutions
added with different additives. Experimental results show that the
foam tendency of ACs can be greatly influenced by surfactants; however,
inorganic salts have little effect on foam tendency. The volume of
generated foam reaches up to 350 mL after ventilation for an AC with
a surfactant, much larger than 40 mL of an AC with an inorganic salt.
The surface tension of ACs reduces with the addition of surfactants,
the lower the surface tension, the more the foam formation. Furthermore,
the presence of arranged surfactants at the gas–solution interface
can increase the intermolecular forces and enhance the liquid and
viscosity of film elasticity, thereby enhancing the foam stability.
Besides, the surfactants would weaken the gas diffusion of foams and
affect the defoaming property of ACs accordingly.
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Mao, Jixin; Chen, Teng; Guo, Li; Yang, Shizhao; Xu, Xin; Ma, Jun; et al. (2020). Effect of Additives on the Foam Behavior of Aviation
Coolants: Tendency, Stability, and Defoaming. ACS Publications. Collection. https://doi.org/10.1021/acsomega.0c02238
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AUTHORS (7)
JM
Jixin Mao
TC
Teng Chen
LG
Li Guo
SY
Shizhao Yang
XX
Xin Xu
JM
Jun Ma
JH
Jianqiang Hu