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A sensible heat-transfer system in which the two fluids flow in opposite directions.



Related Terms

REED VALVES

Flap valves that control the flow of vaporised fuel mixture from the carburettor into the crankcase of a small two stroke motor.

FULL-FLOW FILTRATION

A system of filtration in which the total flow of a circulating fluid system passes through a filter.

PURGE INTERLOCK

A device so arranged that an air flow to the furnace above a minimum must exist for a definite time interval before the interlocking system will permit an automatic ignition torch to be placed in operation.

MIXED FLOW

[CHEMENG] Flow stream existing in two or more phases, such as gas, hydrocarbon, and water. Also known as mixed-phase flow.

DIFFERENTIAL INSTRUMENT

Galvanometer or other measuring instrument having two circuits or coils, usually identical, through which currents flow in opposite directions; the difference or differential effect of these currents actuates the indicating pointer.

MULTIPLE-LOOP SYSTEM

A system whose block diagram has at least two closed paths, along each of which all arrows point in the same direction.

DOUBLE DIRECT SYSTEM

A system that uses flow of refrigerant from a secondary circuit to cool or condense the refrigerant of a primary circuit in an inter-cooler.

DYNAMICAL SIMILARITY

Two flow fields are dynamically similar if one can be transformed into the other by a change of length and velocity scales. All dimensionless numbers of the flows must be the same.

COUPLING CAPACITOR

A capacitor used to block the flow of direct current while allowing alternating or signal current to pass; widely used for joining two circuits or stages. Also known as blocking capacitor; stopping capacitor.

BAND-PASSSYSTEM

Aloudspeaker system, often used for subwoofers, in which the speaker is mounted inside an enclosure on a shelf that divides the enclosure into two parts, and one or both parts are coupled to the outside by a vent; the frequency response of the system is that of a fourth-order band-pass filter (one vent) or an asymmetrical sixth-order band-pass filter (two vents).

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