Eliminate Pesky Bubbles

Even when there are no bubbles in the coating fluid, bubbles still can form from dissolved air coming out of solution. Liquids dissolve less air at elevated temperatures and reduced pressures. Usually the temperature cannot be varied, but where the pressure is reduced, bubbles can form. In flowing fluids, this occurs whenever the fluid speeds up due to a reduction in the cross-sectional area, as in a valve. The increase in kinetic energy due to the more rapidly moving fluid causes this pressure reduction.