CN202886233U - Air viscosity coefficient testing instrument for suspension ball method - Google Patents
Air viscosity coefficient testing instrument for suspension ball method Download PDFInfo
- Publication number
- CN202886233U CN202886233U CN 201220190090 CN201220190090U CN202886233U CN 202886233 U CN202886233 U CN 202886233U CN 201220190090 CN201220190090 CN 201220190090 CN 201220190090 U CN201220190090 U CN 201220190090U CN 202886233 U CN202886233 U CN 202886233U
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- China
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- air
- organic glass
- ball method
- suspension ball
- experiment
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- Expired - Fee Related
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The utility model provides an air viscosity coefficient testing instrument for a suspension ball method. The testing instrument comprises a special air velocity control device, an external pressure sensor and a light small ball for an experiment. An air source capable of adjusting output air quantity provides stable and controllable air flow upward flowing in a round vertical organic glass thin tube; an upward viscous force applying to the light small ball for the experiment and a downward gravity applying to the light small ball for the experiment are balanced; and an air viscosity coefficient can be calculated according to an airflow velocity corresponding to differential pressure indicated by the external pressure sensor and other related measurement data.
Description
Technical field
The utility model relates to the experiment teaching instrument of terms of mechanics in a kind of physics, especially a kind of suspension ball method air tester for viscosity factor.
Background technology
The coefficient of viscosity of air is the important physical amount of a terms of mechanics, and the coefficient of viscosity of measuring air is all having very important significance aspect physics and the engineering.But because of the coefficient of viscosity of air very little, relatively more difficult on measuring, therefore at present the experimental technique aspect the measurement of the air coefficient of viscosity is only had limited several, it is a kind of brand-new experimental technique that the suspension ball method air coefficient of viscosity provided by the utility model is measured, from present existing data check, not yet find the same quasi-instrument that useful the method is made.
Summary of the invention
Understand the principle that the suspension ball method air coefficient of viscosity is measured in order to be convenient to the student, the utility model provides a kind of suspension ball method air tester for viscosity factor.
The design philosophy of suspension ball method air tester for viscosity factor described in the utility model is: design the source of the gas that can regulate discharge quantity of fan, then allow air-flow successively stably by organic glass large cylinder and level, vertical organic glass mini diameter tube, again the lightweight bead of an experiment usefulness is put into vertical organic glass mini diameter tube, the gas velocity that makes progress in the air output of suitable adjusting source of the gas and the vertical organic glass mini diameter tube, the downward gravity that the viscous force that makes progress that bead is subject in air-flow is subject to it balances each other just, so bead just is in the suspension stationary state, radius according to bead, gas velocities in quality and the vertical organic glass mini diameter tube etc. use relevant knowledge in the fluid mechanics just can extrapolate the coefficient of viscosity of air.
Further specify as follows about work of the present utility model and measuring principle: according to hydromechanical Stokes formula, bead suffered viscous force in fluid is: f=6 π η rV, the gravity of bead is: mg=4/3 π r
3ρ g can solve when both are equal: η=2/9 r
2ρ gV
-1, r is the little radius of a ball in the formula, and ρ is bead density, and g is acceleration of gravity, and V is the relative velocity of bead and air motion.The radius of bead and density can be measured in experiment simply, and problem is gas velocity V how to confirm.In designed air velocity control device, include one and can regulate source of the gas, organic glass large cylinder and the level of discharge quantity of fan, vertical organic glass mini diameter tube etc., also has a barometric surveying mouth at the organic glass large cylinder, can the air pressure transmission in the organic glass large cylinder be passed on the external pressure transducer by flexible pipe, according to the Bernoulli's theorem in the fluid mechanics, can calculate: between the speed V of air-flow following relation: V=K (2 Δ P/ ρ) is arranged in the organic glass large cylinder and in the pressure differential deltap P in the ambient atmosphere and the vertical organic glass mini diameter tube
1/2, K is correction factor in the formula, is that 0.955, ρ is the density of air herein, ρ in international unit=1.29 are so finally can get: Δ P=0.675V
2Just can know the speed of corresponding air-flow the vertical organic glass mini diameter tube according to the pressure differential deltap P that is transferred to from the barometric surveying mouth on the external pressure transducer, and then extrapolate the coefficient of viscosity of air.
Suspension ball method air tester for viscosity factor described in the utility model is characterized in that: this analyzer is comprised of special air velocity control device, external pressure transducer, these several parts of lightweight bead of experiment usefulness.
Suspension ball method air tester for viscosity factor described in the utility model, it is characterized in that: the special air velocity control device that comprises, this device include source of the gas, organic glass large cylinder and the level that can regulate discharge quantity of fan, vertical organic glass mini diameter tube four part parts.
Suspension ball method air tester for viscosity factor described in the utility model, it is characterized in that: on the organic glass large cylinder in the special air velocity control device that comprises a barometric surveying mouth is arranged, can the air pressure transmission in the organic glass large cylinder be passed on the external pressure transducer by flexible pipe.
The main technical schemes that its technical matters that solves the utility model adopts is: provided in vertical organic glass mini diameter tube by the source of the gas that can regulate discharge quantity of fan and stablize air-flow controlled, that upwards flow, the downward gravity that allows the viscous force that makes progress that is subject to of lightweight bead of experiment usefulness be subject to it balances each other, and the corresponding gas velocity of pressure reduction of indicating according to external pressure transducer again and other relevant measurement data just can be extrapolated the coefficient of viscosity of air.
The beneficial effects of the utility model are, a kind of experimental technique of the brand-new mensuration air coefficient of viscosity is provided, and make many a kind of instruments of effectively measuring the air coefficient of viscosity on scientific research and the engineering.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structural representation of suspension ball method air tester for viscosity factor.
In Fig. 1: 1. the source of the gas that can regulate discharge quantity of fan, 2. the wind-tunnel mouth on the source of the gas, 3. organic glass large cylinder, 4. barometric surveying mouth, 5. external pressure transducer (containing flexible pipe), 6. level, vertical organic glass mini diameter tube, 7. test the lightweight bead of usefulness, 8. gas piping threeway, 9. end cap, 10. base plate and support.
Embodiment
In Fig. 1, external pressure transducer (5) is linked to each other with barometric surveying mouth (4) by flexible pipe, can regulate again the source of the gas (1) and organic glass large cylinder (3) of discharge quantity of fan, level, vertical organic glass mini diameter tube (6) links to each other successively, make the air-flow of the wind-tunnel mouth (2) on the source of the gas successively by organic glass large cylinder (3) and level, vertical organic glass mini diameter tube (6), and from vertical organic glass mini diameter tube (6), flow out, level, vertical organic glass mini diameter tube (6) is connected by gas piping threeway (8), there is individual end cap (9) lower end of gas piping threeway (8), this end cap (9) is the lower end closed of gas piping threeway (8) during experiment, if air-flow stops the lower end that rear lightweight bead (7) has been fallen gas piping threeway (8), can outward winding end cap (9), to take out lightweight bead (7), whole suspension ball method air tester for viscosity factor all is to support by base plate and support (10).When testing, suitably regulate the air quantity of source of the gas (1), simultaneously lightweight bead (7) is put into vertical organic glass mini diameter tube (6), if lightweight bead (7) can reach the suspension stationary state just, then just the coefficient of viscosity of air can have been extrapolated according to the corresponding gas velocity of pressure reduction of external pressure transducer (5) indication with other relevant measurement data.
Claims (3)
1. suspension ball method air tester for viscosity factor is characterized in that: this analyzer is comprised of special air velocity control device, external pressure transducer, these several parts of lightweight bead of experiment usefulness.
2. a kind of suspension ball method air tester for viscosity factor according to claim 1, it is characterized in that: the special air velocity control device that comprises, this device include source of the gas, organic glass large cylinder and the level that can regulate discharge quantity of fan, vertical organic glass mini diameter tube four part parts.
3. a kind of suspension ball method air tester for viscosity factor according to claim 1, it is characterized in that: on the organic glass large cylinder in the special air velocity control device that comprises a barometric surveying mouth is arranged, can the air pressure transmission in the organic glass large cylinder be passed on the external pressure transducer by flexible pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220190090 CN202886233U (en) | 2012-05-01 | 2012-05-01 | Air viscosity coefficient testing instrument for suspension ball method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220190090 CN202886233U (en) | 2012-05-01 | 2012-05-01 | Air viscosity coefficient testing instrument for suspension ball method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202886233U true CN202886233U (en) | 2013-04-17 |
Family
ID=48077647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220190090 Expired - Fee Related CN202886233U (en) | 2012-05-01 | 2012-05-01 | Air viscosity coefficient testing instrument for suspension ball method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202886233U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104732846A (en) * | 2015-04-03 | 2015-06-24 | 安徽东一特电子技术有限公司 | Somatosensory interaction Bernoulli balance ball presentation device |
| CN106679927A (en) * | 2016-06-15 | 2017-05-17 | 南京工程学院 | Air resistance coefficient meter constructed based on small wind tunnel |
-
2012
- 2012-05-01 CN CN 201220190090 patent/CN202886233U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104732846A (en) * | 2015-04-03 | 2015-06-24 | 安徽东一特电子技术有限公司 | Somatosensory interaction Bernoulli balance ball presentation device |
| CN106679927A (en) * | 2016-06-15 | 2017-05-17 | 南京工程学院 | Air resistance coefficient meter constructed based on small wind tunnel |
| CN106679927B (en) * | 2016-06-15 | 2021-05-11 | 南京工程学院 | Air resistance coefficient tester constructed by small wind tunnel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20150501 |
|
| EXPY | Termination of patent right or utility model |