Heat exchange – Radiator core type – Side-by-side tubes traversing fin means
Patent
1986-10-09
1989-09-26
Jones, Larry
Heat exchange
Radiator core type
Side-by-side tubes traversing fin means
165148, 165170, F28D 104
Patent
active
048693162
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat exchanger, in particular to an improvement of the heat-transfer characteristic of a heat-transfer element such as a heat-transfer fin.
BACKGROUND ART
An example of the heat-transfer unit used in a prior art heat exchanger is shown in FIG. 12.
The drawing is a partial perspective view of the conventional heat-transfer unit that is generally indicated by (1) and disposed in the direction of the flow of a fluid (A) (as indicated by the arrows). The heat-transfer element (1) is basically composed of heat-transfer fins, a heat generator, a heat absorber, a heat accumulator, and a heat radiator. In FIG. 6, the heat-transfer unit consists of a plurality of heat-transfer elements (1a), (1b) and (1c) that are stacked one on top of another and the fluid flows through the passage formed by adjacent heat-transfer elements. Each heat-transfer element (1) is cyclically bent in the direction of fluid flow in the form of trapezoidal waves, the bends in one element being in phase with those in an adjacent element.
The heat-transfer unit of the type described above is hereinafter referred to as an imperforate trapezoidally corrugated plate.
FIG. 13 is a partial perspective view of another conventional heat-transfer unit that consists of a plurality of heat-transfer elements (1) in a plane plate form that are disposed in the direction of the flow of a fluid (A) (as indicated by the arrows). This type of heat-transfer unit is hereinafter referred to as parallel plates.
FIG. 2 is a graph showing the heat-transfer characteristics of the two conventional types of heat-transfer unit, in which the characteristics of the imperforate trapezoidally corrugated plate are indicated by .circle. and those of the parallel plates by . The symbols on the x- and y-axes of the graph are:
As is clear from FIG. 2, the imperforate trapezoidally corrugate plate type heat-transfer unit shown in FIG. 12 and the parallel-plate type heat-transfer unit shown in FIG. 13 have essentially the same heat-transfer characteristics. In the heat-transfer unit of the type shown in FIG. 12, the fluid flows along the individual heat-transfer elements and this would provide the unit with heat-transfer characteristics which are essentially the same as those exhibited by the parallel-plate type heat-transfer unit.
DISCLOSURE OF THE INVENTION
The heat exchanger of the present invention comprises plurality of heat-transfer elements placed side by side each of which has more than one through-hole and which are cyclically bent in a generally trapezoidal waveform in the direction of the flow of a fluid, the bends in one heat-transfer element being in phase with those in an adjacent heat-transfer element in such a manner that the main stream of said fluid will flow not through the holes in each of said heat-transfer elements but through the passage formed by adjacent heat-transfer elements. Because of this arrangement, the fluid flowing along one surface of each heat-transfer element will be sucked in through the holes and blown out of them to flow along the other surface of the heat-transfer element. In the portion where the fluid is sucked in, the thickness of a temperature boundary layer is reduced and in the portion where the fluid is blown out, replacement of fluid bodies will occur, thereby promoting heat-transfer so as to provide improved heat-transfer characteristics for the heat-transfer elements.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial perspective view showing a heat-transfer unit according to a first embodiment of the present invention; FIG. 2 is a graph showing the heat-transfer characteristics of the heat-transfer unit according to the first embodiment of the present invention, as well as two prior art heat-transfer units; FIG. 3 is an illustration of the profile of pressures on the wall surface of a bent fluid passage as a function of the direction of fluid flow; FIGS. 4 and 5 are a partial cutaway view and a partial cross-sectional view of heat-transfer units according to a secon
Hujii Masao
Sakuma Kiyoshi
Seshimo Yu
Yoshida Takayuki
Jones Larry
Mitsubishi Denki & Kabushiki Kaisha
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