# US 12,389,840 B2 · Fluid dynamic rain-making apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,389,840 B2 - Document ID: US12389840B2 - Status: Granted - Kind: B2 - Application number: 18/094,523 - Filed: 2023-01-09 - Published: 2023-07-13 - Granted: 2025-08-19 - Earliest claimed: 2022-01-10 - Applicants: Shih-Hsiung Chen; Shu-Hsia Chang Chien - Inventors: Shih-Hsiung Chen; Shu-Hsia Chang Chien - Web page: https://patentgrep.com/patent/US12389840B2 ## CPC - A01G 15/00: Devices or methods for influencing weather conditions - F28F 1/14: and extending longitudinally (F28F1/38 takes precedence) - E03B 3/28: from humid air (condensing of vapours in general B01D5/00; dehumidification of air for air-conditioning F24F3/14) - F28F 13/08: by varying the cross-section of the flow channels - F25B 23/00: Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect - F28D 2021/0038: {for drying or dehumidifying gases or vapours} - A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12) - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - E03B: INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER (drilling wells, obtaining fluids in general from wells E21B; pipe-line systems in general F17D) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) ## Abstract A fluid dynamic rain-making apparatus includes a first tubular member (10) and a thermal conductor (20). The first tubular member (10) includes a fluid channel having a first opening (12) and a second opening (13). An axial cross section of the fluid channel (11) decreases from the first opening (12) toward the second opening (13). The thermal conductor (20) includes a second tubular member (21) attached to the second opening (13) of the first tubular member (10) and heat sinks (22) circumferentially arranged on an outer surface thereof. A fluid (A) enters the fluid channel (11) from the first opening (11) and forms a cooled fluid (A1) through flowing through the fluid channel (11) for cooling the second tubular member (21), thus the heat sinks (22) are cooler than the external fluid (A). Accordingly, moist air is cooled to reach the dew point to form water drop for rainfall. ## Claims ### Claim 1 A fluid dynamic rain-making apparatus, comprising: a first tubular member (10), comprising a fluid channel (11), the fluid channel (11) comprising a first opening (12) and a second opening (13) defined on two ends thereof respectively, and an axial cross section of the fluid channel (11) decreasing along a direction from the first opening (12) toward the second opening (13); and a thermal conductor (20), comprising a second tubular member (21) and a plurality of heat sinks (22) circumferentially arranged on an outer surface of the second tubular member (21), the second tubular member (21) attached to the second opening (13) of the first tubular member (10); wherein a fluid (A) enters the fluid channel (11) from the first opening (12) to be a cooled fluid (A1) after acceleratedly flowing through the fluid channel (11), and the cooled fluid (A1) cools the second tubular member (21) while flowing through the second tubular member (21) to make a temperature of each one of the heat sinks (22) be lower than a temperature of the fluid (A) at an external of the thermal conductor (20). ### Claim 2 (depends on 1) The fluid dynamic rain-making apparatus according to claim 1, wherein each one of the heat sinks (22) is arranged parallel to a flowing direction of the fluid (A). ### Claim 3 (depends on 1) The fluid dynamic rain-making apparatus according to claim 1, wherein a shape of a radial cross section of the second tubular member (21) is identical to a shape of a radial cross section of the first tubular member (10). ### Claim 4 (depends on 3) The fluid dynamic rain-making apparatus according to claim 3, wherein a shape of a radial cross section of the fluid channel (11) is a circular shape. ### Claim 5 (depends on 3) The fluid dynamic rain-making apparatus according to claim 3, wherein a shape of a radial cross section of the fluid channel (11) is a rectangular shape. ### Claim 6 (depends on 1) The fluid dynamic rain-making apparatus according to claim 1, further comprising a third tubular member (30), the third tubular member (30) comprising a third opening (31) and a fourth opening (32) defined on two ends thereof, and the third opening (31) attached to the second tubular member (21). ### Claim 7 (depends on 6) The fluid dynamic rain-making apparatus according to claim 6, wherein a shape of a radial cross section of the third tubular member (30) is identical to a shape of a radial cross section of the second tubular member (21), and an axial cross section of the third tubular member (30) increases along a direction from the third opening (31) toward the fourth opening (32). ### Claim 8 (depends on 6) The fluid dynamic rain-making apparatus according to claim 6, further comprising a tail vane (60) arranged on the third tubular member (30), and the tail vane (60) arranged parallel to a flowing direction of the fluid (A) and perpendicular to the second tubular member (21). ### Claim 9 (depends on 8) The fluid dynamic rain-making apparatus according to claim 8, further comprising a pair of horizontal tail vanes (61) arranged on two sides of the third tubular member (30) respectively, and the pair of horizontal tail vanes (61) arranged parallel to each other and perpendicular to the tail vane (60) respectively. ### Claim 10 (depends on 1) The fluid dynamic rain-making apparatus according to claim 1, further comprising a pair of side wings (50) arranged symmetrically and parallelly to each other on the outer surface of the second tubular member (21).