CN102568281A - Adiabatic compression measuring method for air's specific heat capacity ratio - Google Patents
Adiabatic compression measuring method for air's specific heat capacity ratio Download PDFInfo
- Publication number
- CN102568281A CN102568281A CN2011104503345A CN201110450334A CN102568281A CN 102568281 A CN102568281 A CN 102568281A CN 2011104503345 A CN2011104503345 A CN 2011104503345A CN 201110450334 A CN201110450334 A CN 201110450334A CN 102568281 A CN102568281 A CN 102568281A
- Authority
- CN
- China
- Prior art keywords
- air
- specific heat
- pressure
- heat capacity
- capacity ratio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses an adiabatic compression measuring method for air's specific heat capacity ratio, and relates to the technical field of physical experiments, in particular to measurement of air's specific heat capacity ratio. The air's specific heat capacity ratio experiment is a classical experiment in university physics experiments; and because the adiabatic conditions of air containers are not strict enough, and most of the air conditioners are glass containers, so the measurement value is generally small. A high-density polyurethane plastic tube with the diameter of 4 millimeters, the wall thickness of 1 millimeter and the length of 5 meters is used in the method; air pressure and environmental temperature in the tube are measured by adiabatic compression inflation, the air pressure in the tube can be measured after 2 days at the same room temperature, and the air's specific heat capacity ratio is calculated through change of the air pressure in the tube relative to the atmospheric pressure; and air leakage is judged by a few days of observation, air is not leaked if the air pressure fluctuates, and air is leaked if the pressure value is reduced all the time. High-density polyurethane with the tensile modulus of the magnitude level 1GPa and extremely poor heat conducting performance is a good air container material.
Description
Technical field
The present invention relates to the Physical Experiment technical field, particularly the measurement of air ratio ratio of specific heat.
Background technology
The air ratio ratio of specific heat is the classical experiment of of Experiment of College Physics; The characteristics of Experiment of College Physics are: require the student to accomplish the measurement of a plurality of data in 3-4 class hour; Last class hour teacher generally will explain, and the student is familiar with and will spends the regular hour experimental apparatus, leave for do experiment time roughly with regard to 2-3 class hour; Accomplish experiment in the short like this time; Then just too strictness of the adiabatic condition of air vessel, the time that the gas after the strictness after wait adiabatic compression or the adiabatic expansion is got back to room temperature through heat radiation or absorption is just oversize, so the most of employings of the measurement of present air ratio ratio of specific heat is glass container.
What on measuring, adopt is under the measurement uniform temp, gets back to the pressure of uniform temp before inflating and after inflating, and gets back to the pressure of uniform temp before perhaps expanding and after expanding.
The heat interchange of glass container is too fast, and generally the speed of inflating does not catch up with, and can't adopt exhausted people's compression method to come the Measurement of Air specific heat ratio; Usually adopt adiabatic expansion method Measurement of Air specific heat ratio, the venting speed that adiabatic expansion requires will be near can ignoring, otherwise will cause measured value less than normal, and common deflation time is all about 1 second, usually measured value 5%-10% all less than normal.
Summary of the invention
For overcoming heat radiation and the measured value that brings of heat absorption is less than normal, the present invention adopts the reasonable material of heat-insulating property, through measuring the pressure values that slowly rejects heat to temperature when inflating after the adiabatic compression.
The technical solution adopted for the present invention to solve the technical problems is:
Suppose that indoor gas pressure intensity is P
1, room temperature is T
1, then first state of adiabatic compression is (P
1, V
1, T
1); Adiabatic compression to the second state is (P
2, V
2, T
2), wherein the pressure after the adiabatic compression is P
2, V
2Be the volume of gas container, T
2It is the temperature of gas after the adiabatic compression; Slowly rejecting heat to the 3rd state is (P
3, V
2, T
1), P wherein
3Be that gas temperature is reduced to room temperature T
1Pressure, the air adiabatic equation is
Wherein
is the air ratio ratio of specific heat; Because the temperature of first state and the third state is identical, then the air state equation is
Only need to measure the pressure difference of three states, just can the Measurement of Air specific heat ratio.
Experiment embodiment: use the high density polyurethane plastic tube; Caliber 4mm; Pipe thickness 1mm, length 5m, the pressure that adiabatic compression is inflated when accomplishing is 357hpa (wherein hPa=100Pa); Pressure values when the room temperature after 6 days is identical is 246hpa; The atmospheric value in Chengdu is 960hPa, and air ratio ratio of specific heat
=ln (960/ (960+357))/ln (960/ (960+246))=1.386 is more approaching with theoretical value 1.402.
In fact, after 2 days identical room temperature just can measuring tube in gas pressure intensity, the change calculations air ratio ratio of specific heat through gas pressure intensity in the pipe then; But will judge whether gas leak phenomenon in the experiment, will note the sealing of each joint location in the experiment, avoid gas leakage, the judgement of gas leakage is logical observation in a few days, if gas pressure intensity is in fluctuation then does not have gas leakage if pressure values is reducing always gas leakage is arranged.
The invention has the beneficial effects as follows: because the stretch modulus of high density polyurethane can reach the 1GPa order of magnitude, the draught head of adiabatic compression is generally at 10-20KPa, and pressure gas can be ignored the deformation influence of high density polyurethane plastic tube; Therefore the heat conductivility extreme difference of high density polyurethane can reach insulation effect preferably; Measuring Time also was not long with respect to most scientific experiment in 2 days, also was worth for the value that can accurately obtain specific heat ratio, had really realized adiabatic condition.
Claims (1)
1. air ratio ratio of specific heat adiabatic compression mensuration of the present invention is characterized in that: adopt the high density polyurethane plastic tube, bore 4mm, pipe thickness 1mm, length 5m; Measure the pressure and the room temperature of gas after the adiabatic compression, after 2 days, measure gas pressure intensity in the pipe this moment during identical room temperature, according to gas pressure intensity value and atmospheric value calculating air ratio ratio of specific heat in the pipe; Will note the sealing of each joint location in the experiment, avoid gas leakage, the judgement of gas leakage is logical observation in a few days, if gas pressure intensity is in fluctuation then does not leak gas if pressure values is reducing always gas leakage is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104503345A CN102568281A (en) | 2011-12-29 | 2011-12-29 | Adiabatic compression measuring method for air's specific heat capacity ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104503345A CN102568281A (en) | 2011-12-29 | 2011-12-29 | Adiabatic compression measuring method for air's specific heat capacity ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102568281A true CN102568281A (en) | 2012-07-11 |
Family
ID=46413586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104503345A Pending CN102568281A (en) | 2011-12-29 | 2011-12-29 | Adiabatic compression measuring method for air's specific heat capacity ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102568281A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778543A (en) * | 2012-08-10 | 2012-11-14 | 南京千韵电子科技有限公司 | Device for measuring ratio of specific heat capacity of gas |
| CN104297289A (en) * | 2014-10-28 | 2015-01-21 | 四川大学 | Improved device for measuring air specific heat ratio through adopting vibration method |
| CN104849309A (en) * | 2015-05-25 | 2015-08-19 | 南京工业大学 | Intelligent tester and testing method for testing gas ratio and heat capacity ratio |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2040208U (en) * | 1987-09-02 | 1989-06-28 | 营口市示范消声器厂 | Insulating polyurethane tube with outer plastic casing |
| CN2462216Y (en) * | 2000-12-25 | 2001-11-28 | 江苏国兴通风设备有限公司 | Preadiabetic tube |
| CN201262285Y (en) * | 2008-08-12 | 2009-06-24 | 林云青 | High-foaming plastic composited thermal insulation pipe |
-
2011
- 2011-12-29 CN CN2011104503345A patent/CN102568281A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2040208U (en) * | 1987-09-02 | 1989-06-28 | 营口市示范消声器厂 | Insulating polyurethane tube with outer plastic casing |
| CN2462216Y (en) * | 2000-12-25 | 2001-11-28 | 江苏国兴通风设备有限公司 | Preadiabetic tube |
| CN201262285Y (en) * | 2008-08-12 | 2009-06-24 | 林云青 | High-foaming plastic composited thermal insulation pipe |
Non-Patent Citations (2)
| Title |
|---|
| 李娟: "空气比热容比实验的非绝热问题", 《物理实验》 * |
| 毛骏健: "空气比热容比实验的改进", 《实验室研究与探索》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778543A (en) * | 2012-08-10 | 2012-11-14 | 南京千韵电子科技有限公司 | Device for measuring ratio of specific heat capacity of gas |
| CN104297289A (en) * | 2014-10-28 | 2015-01-21 | 四川大学 | Improved device for measuring air specific heat ratio through adopting vibration method |
| CN104297289B (en) * | 2014-10-28 | 2016-08-31 | 四川大学 | Vibratory drilling method measures the improved device of air specific heat ratio |
| CN104849309A (en) * | 2015-05-25 | 2015-08-19 | 南京工业大学 | Intelligent tester and testing method for testing gas ratio and heat capacity ratio |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102944358B (en) | High and low temperature vacuum calibrating device and method | |
| CN103090583B (en) | Magnetic refrigeration apparatus and magnetic thermal modules thereof | |
| CN103674452B (en) | A kind of leakage detection method of floating air bag | |
| ATE520927T1 (en) | STORAGE SYSTEM FOR CRYOGENIC FLUID IN A SPACE VEHICLE | |
| CN102568281A (en) | Adiabatic compression measuring method for air's specific heat capacity ratio | |
| CN101251430A (en) | Method and system for detecting and locating leakage based on infrared imagery technique | |
| CN203658197U (en) | Novel air specific heat ratio determinator | |
| CN103808457A (en) | Low-temperature vacuum calibration device and method | |
| CN203981234U (en) | Pneumatic process volume measurement device | |
| CN102542880A (en) | Method for quickly measuring air specific heat ratio | |
| CN103837567B (en) | The liquid specific heat capacity measurement device of energy self-equilibrating pressurization and method | |
| CN104614036A (en) | System and method for measuring volume of tank body of tank truck | |
| CN103604572A (en) | Leakage detection method for central air conditioner copper tube | |
| CN204404958U (en) | A kind of spool feeler gauge | |
| CN204102396U (en) | Adopting heat pipes for heat transfer performance measurement experiment table | |
| CN102087159B (en) | Differential pressure leakage detecting method for double primary standards | |
| CN106844820B (en) | Carbon dioxide inflow parameter determination method based on deep space exploration test | |
| CN205174920U (en) | Cold mirrors formula dew point hygrometer refrigerating system | |
| CN206208884U (en) | A kind of device of accurate surveying gas hydrate induction time | |
| CN110823894B (en) | Sounding balloon low-temperature blasting testing device and testing method | |
| CN206891545U (en) | A kind of gas flow standard part calibrating installation | |
| CN209589391U (en) | A kind of refrigerator car air-tightness test device | |
| CN208171507U (en) | A kind of portable gas pressure test device | |
| CN107202671A (en) | A kind of anhydrous leakage detection apparatus of wire-tube evaporator | |
| CN202275543U (en) | Simple neutralization heat meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120711 |