Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1980-12-17
1984-03-20
Makay, Albert J.
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
98 209, 98 40E, 98 40N, 137826, 239389, B60H 124
Patent
active
044373929
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND BRIEF DESCRIPTION OF THE INVENTION
This application includes subject matter disclosed and claimed in my U.S. application Ser. No. 30,794 filed Apr. 17, 1979 and now issued as U.S. Pat. No. 4,250,799 on Feb. 17, 1981 and entitled "Sweeping Air Stream Apparatus and Method", and my U.S. application Ser. No. 119,699 filed Feb. 8, 1980 and issued as U.S. Pat. No. 4,336,909 on June 29, 1982 entitled "Oscillating Reed and Method".
The subject matter is also related to subject matter disclosed in my divisional application Ser. No. 302,285 filed Sept. 14, 1981 and entitled "Oscillating Reed and Method" and my divisional application Ser. No. 200,611 filed Oct. 24, 1980 entitled "Sweeping Air Stream Apparatus and Method" which is a division of my U.S. Pat. No. 4,250,799.
The invention generally is directed to air flow and distribution systems and in particular, to the treated air flow systems in automobiles such as defrosters, air conditioning and heating systems.
In automobile systems, the defrost system and the air conditioning system as well as the heating system typically are all contained under the dashboard and prior art efforts to use standard (feedback) type fluidic nozzles while, basically, functionally good in sweeping a jet of air across the windshield, physical size of the fluidic element in much too large to fit within the dash, particularly in small and downsized automobiles. For example, the outlet of some automobile ducting is about 3.times.5 inches. If one were to use the samller 3" dimension for the power nozzle width (W) of the fluidic element, the resultant length of the nozzle would be too long. Experiments with the resultant sweeping air jet from such a large element to discover more about its uniformity characteristics in the air showed that the frequency standard of the oscillator is in the order of 10 H.sub.z and at an air velocity of about 100 feet per second the characteristic wavelength is in the order of about 10 feet which is satisfactory. Various electrically powered oscillatory elements have been suggested, however they add cost, complexity and maintenance problems and are not silent.
The operational basis for the oscillating jet is that a concentrated jet would be uniformly swept over the windshield so that the intensity of the heat, because of minimal mixing with ambient, would be maximized at the point of impact of the air stream but would be uniformly distributed by the sweeping action. In order to accomplish this, the sweeping rate or frequency of the air stream must be low enough compared to the velocity of the air jets so that the wavelength is long compared to the nozzle. When the wavelength is long, a small portion of the stream resides in the ambient air before impacting the windshield. On the other hand, with a short wavelength much of the stream resides in the ambient air, producing severe mixing with the ambient, which for defrost purposes tends to defeat the purpose at hand. However, for air conditioning purposes, a low sweeping rate is desired in the initial cool down phase of the air confined within the automobile and, after the vehicle has been cooled down, a mixing with the ambient is desired so as to maintain the temperature. This dual sweep frequency concept is also desirable for the heating of the vehicle that is to say, the initial heating is obtained by a low rate or frequency of sweeping of the air stream in the passenger compartment in order to more rapidly cool down or heat up the passenger compartment and then, after a short time interval the sweep rate is increased to thereby produce mixing of the freshly cooled or heated air with the air in the passenger compartment.
In order to satisfy the requirement of small space and to minimize ambient mixing for defrost operation (which is undesirable since it lowers the thermal energy of air impacting the windshield), the present invention provides an oscillator whose frequency is independent of the air stream properties and whose frequency is characteristically low. However, the invention also provid
REFERENCES:
patent: 3342198 (1967-09-01), Groeber
patent: 3408050 (1968-10-01), Jacobs
patent: 3687369 (1972-08-01), Johnstone
patent: 3832939 (1974-09-01), Kakei et al.
patent: 3942558 (1976-03-01), Honda et al.
patent: 4019260 (1977-04-01), Levy et al.
R. E. Dennis, "Oscillating Aperture Card Ruffler-Air Operated", TBM Technical Disclosure Bulletin, vol. 11, No. 11, Apr. 1969, pp. 1493 and 1494.
Bowles Fluidics Corporation
Joyce Harold
Makay Albert J.
Zegeer Jim
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