Initial liquid containing fine bubbles is produced by mixing water and air (step S11). Fine bubbles have diameters of less than 1 m. The density of bubbles in the initial liquid is measured (step S13), and when the measured density is less than a target density (step S14), the initial liquid is heated and reduced in pressure so that the liquid is vaporized (step S15). As a volume of the liquid decreases, the density of fine bubbles increases, and high-density fine bubble-containing liquid is easily obtained. Alternatively, by increasing the density of fine bubbles in the initial liquid with using a filter that does not pass all fine bubbles, high-density fine bubble-containing liquid is easily acquired (step S15). When the density of bubbles in the initial liquid is greater than the target density, the initial liquid is diluted (step S16).

In order to eliminate liquid accumulation occurring between a gas-liquid mixing part and a vaporization part to stably perform liquid feeding to the vaporization part and vaporization in the vaporization part, a liquid material vaporization apparatus includes: a gas-liquid mixing part adapted to mix a liquid material and gas to produce a gas-liquid mixture; and a vaporization part adapted to heat the gas-liquid mixture to vaporize the liquid material. In addition, the gas-liquid mixing part has a gas-liquid mixture lead-out pipe for leading out the gas-liquid mixture, the vaporization part has a heating flow path HS for heating the gas-liquid mixture, and a lead-out port of the gas-liquid mixture lead-out pipe is arranged in the heating flow path HS.

A protein system may include a mixer configured to combine a powdered protein mix with water to produce a liquid protein blend. A protein system may include a liquid protein batch tank fluidly coupled to the mixer and configured to receive the liquid protein blend from the mixer. A protein system may include a holding subsystem including a liquid protein holding tank fluidly coupled to the liquid protein batch tank and configured to store the liquid protein blend received from the liquid protein batch tank, wherein the liquid protein holding tank is configured to maintain a temperature of the liquid protein blend contained therein less than or equal to 40 degrees Fahrenheit.

A humidification system for a process gas uses a plurality of differently sized steam eductors in order to control a relative humidity of a process gas.