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A process that operates on a continuous flow (materials or time) basis, in contrast to batch, intermittent, or seof products, such as chemicals or paper, involving a sequence of processes performed by a series of machines receiving the materials through a closed channel of flow.

Related Terms


Characteristically random flow patterns that form eddies from large to small scales. For internal flows, it occurs at Reynolds numbers greater than 4000. Turbulence is integral to the mixing process between the fuel and air for combustion.


  1. The gas ionization that initiates current flow in a gas-discharge tube. 2. Excitation of a magnetron or transmit-receive tube by a pulse. 3. The transition from the unsaturated to the saturated state of a saturable reactor. 4. The act or process of adding fuel and air to a furnace. 5. Igniting an explosive mixture. 6. Treating a ceramic product with heat.


A liquid-liquid extraction process in which the solvent and the process stream in contact with each other flow in opposite directions. Also known as countercurrent separation.


A process using interconnected components that form a closed circuit in which refrigerant is circulated for the purpose of absorbing and then releasing heat for the purpose of cooling.


Process of leaching by the use of continuous equipment in which the solid and liquid are both moved mechanically, and by the use of a series of leach tanks and the countercurrent flow of solvent through the tanks in reverse order to the flow of solid.


A process control arrangement that separates the in-plant measuring points (for example, pressure, temperature, and flow rate) and control points (for example, a valve actuator) from the recorder or indicator at the central control panel.


Falls which flow alternately in opposite directions in a narrow channel in the St. John River, New Brunswick, Canada, due to the large range of tide and a constriction in the river. The direction of flow is upstream or downstream according to whether it is high or low water on the outside, the falls disappearing at the half- tide level.


A carbon-black process in which iron channel beams are used as depositing surfaces for carbon black.


A moving body of solids in which particles (granules, pellets, beads, or briquets) flow downward by gravity through a vessel, while process fluid flows upward; the moving-bed technique is used in blast and shaft furnaces, petroleum catalytic cracking, pellet dryers, and coolers.


A check valve that can be manually closed to prevent the back flow of steam from a header to a boiler.

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