US 8,298,493 B2 · Heat exchange apparatus

Abstract

The heat exchange apparatus provides a flow passage for the heat exchange fluid comprising a succession of flow passage chamber portions separated from one another by intervening throttle forming passage portions of smaller cross section, and therefore of smaller flow capacity, transverse to the flow direction, so that the heat exchange fluid moves at a higher velocity in the throttle forming portions than in the chamber portions. The fluid is moved at a rate such that its velocity in the throttle forming portions is high enough to reduce the thickness of the fluid boundary layer on the passage wall and thereby facilitate the heat exchange. Alternatively, or in addition, the velocity is high enough to at least reduce the rate of fouling of the passage wall surface. Alternatively, or in addition, the fluid flows as eddy vortices, the spacing of the chamber portions along the passage being such that wake interference flow is established which enhances the rate of heat exchange. The exchanger is intended principally for use in combination with a spinning tube in tube reactor with a very small annular cross section reaction passage between them, the exchanger also being of tubular form with the stator tube constituting a wall of the heat exchanger.

Claims21

Dependent claims

Heat exchange apparatus comprising a heat exchange wall through which heat exchange takes place from one wall surface to an opposite wall surface;

a heat exchange structure disposed at the one wall surface and providing a flow passage for the flow therein in a flow direction of heat exchange fluid in heat exchange contact with the one wall surface;
the flow passage comprising a succession of flow passage chamber portions, each of which is connected to any preceding and successive flow passage chamber portion by a respective flow passage throttle forming portion, both the chamber and the throttle forming portions having the flow passage one wall as a wall thereof, the throttle forming portions being of smaller flow cross section transverse to the flow direction than that of the connected flow passage chamber portions;
whereby heat exchange fluid passing in the flow passage has a higher velocity during its passage through the throttle forming portions than in the passage chamber portions;
the apparatus also comprising means for moving the heat exchange fluid through the flow passage at a flow rate such that its velocity, at least in the throttle forming portions, is high enough to reduce the thickness of the heat exchange fluid boundary layer in the throttle portions, and thereby facilitate heat exchange from the heat exchange fluid to the one wall surface.

1 more element

Heat exchange apparatus comprising a heat exchange wall through which heat exchange takes place from one wall surface to an opposite wall surface;

a heat exchange structure disposed at the one wall surface and providing a flow passage for the flow therein in a flow direction of heat exchange fluid in heat exchange contact with the one wall surface;
the flow passage comprising a succession of flow passage chamber portions, each of which is connected to any preceding and successive flow passage chamber portion by a respective flow passage throttle forming portion, both the chamber and the throttle forming portions having the flow passage one wall as a wall thereof, the throttle forming portions being of smaller flow cross section transverse to the flow direction than that of the connected flow passage chamber portions;
whereby heat exchange fluid passing in the flow passage has a higher velocity during its passage through the throttle forming portions than in the passage chamber portions;
the apparatus also comprising means for moving the heat exchange fluid through the flow passage at a flow rate such that its velocity, at least in the throttle forming portions, is high enough to at least reduce the rate of fouling of the one wall surface.

1 more element

Heat exchange apparatus comprising a heat exchange wall through which heat exchange takes place from one wall surface to an opposite wall surface;

a heat exchange structure disposed at the one wall surface and providing a flow passage for the flow therein in a flow direction of heat exchange fluid in heat exchange contact with the one wall surface;
the flow passage comprising a succession of flow passage chamber portions, each of which is connected to any preceding and successive flow passage chamber portion by a respective flow passage throttle forming portion, both the chamber and the throttle forming portions having the flow passage one wall as a wall thereof, the throttle forming portions being of smaller flow cross section transverse to the flow direction than that of the connected flow passage chamber portions;
whereby heat exchange fluid passing in the flow passage has a higher velocity during its passage through the throttle forming portions than in the passage chamber portions;
the apparatus also comprising means for moving the heat exchange fluid through the flow passage at a flow rate such that the heat exchange fluid flows in the flow passage chamber portions as laminar eddies contacting the one wall surface, and that the spacing of the flow passage chamber portions along the flow passage is such that wake interference flow is established in the flow passage to thereby enhance the rate of heat exchange between the heat exchange fluid and the one wall surface.

1 more element

Dependencies are inferred from the claim text.

Heat exchange apparatus

Life of this patent

Heat exchange apparatus

Life of this patent

Abstract

Claims21