Flow separation or boundary layer separation is the detachment of a boundary layer from a surface into a wake.

A duct for smoke and waste gases produced by a fire, a gas heater, a power station, or other fuel-burning installation.

Gas that is expelled from an engine via a flue.

A process to remove sulphur dioxide from exhaust gases in power plants that use hydrocarbons as a fuel.

A preheater arranged in the flue gas duct of boiler used for preheating of feedwater with no steam produced.

If available, flue gas from ship boilers can be used for inerting. The flue gas system washes and cools the boiler flue gas, and delivers it to the cargo tanks during cargo unloading and tank washing.

It consists of a flue gas system supplemented by a separate small (500 Nm3/h) inert gas generator. The flue gas system covers the bulk of the inerting during cargo unloading, and the topping up generator tops up tank pressures during the sea voyage.

A liquid, a gas or combination thereof.

In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids/liquids and gases.

Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other.

Fluid mechanics is the branch of physics concerned with the mechanics of fluids (liquids, gases, and plasmas) and the forces on them.

Fluid pressure is most often the compressive stress at some point within a fluid.

Fluidics, or fluidic logic, is the use of a fluid to perform analog or digital operations similar to those performed with electronics.

Fluidization is a process similar to liquefaction whereby a granular material is converted from a static solid-like state to a dynamic fluid-like state.

A gasifier whereby the fuel is fluidized in oxygen and steam or air.

A roll stabilisation system using an athwartships tunnel or tank connecting two wing tanks. The water movement is out of phase with the rolling motion and creates a moment which counteracts the roll.

A ship that has no superstructure on the freeboard deck.

Velocity of fluid (often stated in feet/second) required to force air out of any pipe in a ground loop heat exchanger, generally accepted minimum is 2 feet/sec.

An arc welding process that uses an arc between a continuous filler metal electrode and the weld pool.

Fly ash or flue ash is a coal combustion product that is composed of the particulates (fine particles of burned fuel) that are driven out of coal-fired boilers together with the flue gases.