Heat exchange – Radiator core type – Side-by-side tubes traversing fin means
Patent
1991-12-13
1993-04-13
Flanigan, Allen J.
Heat exchange
Radiator core type
Side-by-side tubes traversing fin means
165182, F28F 132
Patent
active
052013677
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to heat-exchange technology, and more particularly it relates to a stack of plates for a plate-fin heat exchanger with diverging-converging passages, and to a rotary die set for manufacturing plates for this stack.
PRIOR ART
One known prior art design involves a stack of plates for a plate-and-tube heat exchanger with diverging-converging passages (PCT/SU, 79/00041) intended for water-to-air heat exchangers in motor vehicles and the radiators of diesel locomotives. This design of a stack of plates for a plate-and-tube heat exchanger with diverging-converging passages includes a plurality of stacked plates having a zig-zag profile and defining passages in the direction of the flow of the first heat-exchange medium, the profile of each passage being a succession of alternating diverging and converging portions, each plate having, in the direction perpendicular to the flow of the first medium, at least one row of uniformly spaced openings which accommodate tubes for the flow of the other heat-exchange medium. In other words, the stack is made up of plates of two types, the plates of these two types differing from each other in that, in the assembled stack, the zig-zag profile of the plates of the first type is offset from the zig-zag profile of the plates of the second type in the flow direction of the first medium by one half of the pitch of the zig-zag pattern, the zig-zag profile of each individual plate being the same throughout its length.
The stack of plates for a heat exchanger with diverging-converging passages features high heat-transfer and hydraulic efficiency; thus, in comparison with a stack of plates for a plate-and-tube heat exchanger with either plain or sinuous passages of a similar geometry, it allows halving the volume of the stack and reducing its weight to one half or even one fourth the weight of a conventional stack in a water radiator of a tractor or combine harvester engine, with other conditions being equal (Dubrovsky E. V. Dunayev V. P., Kuzin A. I., Martynova N. I. "Perfection of designs of heat exchangers for tractors and combine harvesters" /Sovershenstovovanye konstruktsii teploobmennikov dlya traktorov i combainov/, Traktory i Selkhozmashiny, No. 8, pp. 2-8, 1985, USSR). This is due to the fact that the walls of diverging-converging passages generate and propagate in the wall-adjoining layer of the heat-carrier flow recurring three-dimensional vortexes which are weakly diffused into teh nucleus of the flow. Consequently, the amount of turbulent heat conductivity and transfer of the heat-carrier flow in its wall-adjoining layer rises several times, and its turbulent viscosity likewise grows. Hence, the growth of the heat transfer coefficient in diverging-converging passages either surpasses or is equal to the growth of the pressure loss factor therein, in comparison with either plain or sinuous passages of a similar geometry, with other conditions being equal. This physical situation may be illustrated by an expression: ##EQU1## where .alpha..sub.1, .alpha..sub.2 are, respectively, the coefficients of heat transfer in diverging-converging and plain passages; and diverging-converging and plain passages.
In water-to-air radiators, the coefficient K of heat transfer is about equal quantitatively to the coefficient .alpha. of heat transfer of the air-engaging heat-exchange surface of the radiator (K.apprxeq..alpha.). Thus, the feasibility of intensifying the heat exchange in a stack of a water-to-air late-and-tube heat exchanger with diverging-converging passages is practically completely defined by the above expression (1), which can be illustrated by another expression. ##EQU2## where K.sub.1, K.sub.2 are, respectively, the heat transfer coefficients of water-to-air radiators with diverging-converging and plain passages; water-to-air radiators with diverging-converging and plain passages.
As a stack of plates for a plate-and-tube heat exchanger with diverging-converging passages is made of plates of two types, the manufacturing of the stac
REFERENCES:
patent: 1920313 (1933-08-01), Mautsch
patent: 3650233 (1972-03-01), Young et al.
patent: 3698222 (1972-10-01), Blake
patent: 4586563 (1986-05-01), Dubrovsky et al.
patent: 4592420 (1986-06-01), Hughes
Dubrovsky E. V., Dunayev V. P., Kuzin A. I., Martynova N. I. "Perfection of designs of heat exchangers for tractors and combine harvesters"/Sovershenstvovanye konstruktsii teploobmennikov dlya traktorov i combainov/, Traktory i Selkhozmashiny, No. 8, pp. 2-8, 1985, USSR.
Babichev Z. V. "Production of Automotive Radiators"/Proizvodstov avtomobilnykh radiatorov/, 1958, Gosudar-stvennoe Nauchno-Technicheskoye Izdatelstvo Mashino-stroitelnoi Literatury/Moscow, p. 111.
Averkiev Leonid A.
Dubrovsky Evgeny V.
Kopylov Alexandr A.
Nagornov Vladimir P.
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