CN107421855B - A kind of device and its measuring method of steady state method measuring and calculating porous material mass tranfer coefficient - Google Patents
A kind of device and its measuring method of steady state method measuring and calculating porous material mass tranfer coefficient Download PDFInfo
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- CN107421855B CN107421855B CN201710749745.1A CN201710749745A CN107421855B CN 107421855 B CN107421855 B CN 107421855B CN 201710749745 A CN201710749745 A CN 201710749745A CN 107421855 B CN107421855 B CN 107421855B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention relates to the devices and its measuring method of a kind of steady state method measuring and calculating porous material mass tranfer coefficient, belong to porous material physical parameter measuring and calculating field.It include: speed governing blast blower, the components such as temperature and humidity controller, air is blasted air pipeline by speed governing blast blower, the heating coil and humidifier of temperature and humidity controller will rectify after air warming and humidifying through honeycomb structure, flowmeter, temperature sensor, humidity sensor is successively placed on rear side of honeycomb structure, porous material sample upper surface is concordant with air pipeline inner wall, hygrometer A is placed at porous material sample upper surface, hygrometer B is placed in pipeline exit, porous material sample is placed on bracket, bracket is put into the sink B wall for filling thermostatted water, sink B is placed in sink A, moisture transducer is placed at the different thickness of sample, moisture transducer is connected by data acquisition board with computer.The present invention can effectively calculate the moisture diffusion coefficients and convective transfer coefficient of sample at different conditions.
Description
Technical field
The present invention relates to the devices and its measuring method of a kind of steady state method measuring and calculating porous material mass tranfer coefficient, belong to porous material
Material parameter measurement field.
Background technique
Porous material is the porosu solid containing a large amount of holes.Accurate measure porous material heat and mass transfer coefficient is to drier
Equal heat and mass transfer processes new equipment exploitation design, performance improvement, process parameter optimizing and porous material product processing quality and
The raising of theoretical calculation precision plays an important role.But there is experiments to calculate no respective standard, different measuring methods again simultaneously
The biggish deficiency of result difference makes it not only restrict results of measuring, and in the popularization solved in engineering problem and answers
With, have an effect on people porous material heat and mass transfer mechanism is correctly recognized and further further investigation.Currently, porous material moisture
The measuring and calculating of diffusion coefficient and convective transfer coefficient (convective transfer coefficient can be derived by moisture diffusion coefficients) is mostly based on Fick
Second law theory approximate solution, empirical solution, numerical solution analyze geomery, the unstable state moisture of one timing of temperature and humidity expands
Dissipate experimental data.And in unstable state measuring and calculating, the convective mass transfer flux in sample in the moisture content and each section of each point exists
Constantly variation, simultaneously because the hesitation of measurement, there are deviations for measurement.This causes to realize single argument and multivariable variation pair
Porous material moisture diffusion coefficients and convective transfer coefficient measuring and calculating and its change mechanism analysis cause bigger difficulty.And in stable state
In method of determining and calculating, common method is stable state agar diffusion method.It can make system reach stable state, but opposite using the air of membrane boundary
Humidity does not measure influence of the moisture content of material internal to moisture diffusion coefficients and convective transfer coefficient.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of steady state method measuring and calculating porous material mass tranfer coefficient device and its
Measuring method can solve in the hesitation that occurs and measurement accuracy when cold store enclosure measuring and calculating not high disadvantage and stable state agar diffusion method
The sample internal moisture concentration of appearance is not easy the shortcomings that measuring.Key of the present invention is when system reaches lower state, according to survey
The physical parameter obtained calculates separately the moisture of sample at different conditions with the cooling Newton's formula of Fick's first law and analogy
Diffusion coefficient and convective transfer coefficient.
The technical solution adopted by the present invention is that: a kind of device of steady state method measuring and calculating porous material mass tranfer coefficient, including speed regulation
Air blower 1, temperature and humidity controller, honeycomb structure 3, flowmeter 4, hygrometer A5, moisture transducer 6, porous material sample 7, absolutely
Hot waterproof material 8, hygrometer B9, constant temperature water tank 10, sink A11, bracket 12, sink B13, data acquisition board 14, computer 15；
The air outlet of the speed governing blast blower 1 is connected to air pipeline, and air is blasted air pipeline, temperature and humidity controller
It is made of heating coil 2-1, humidifier 2-2, control panel 2-3, temperature sensor 2-4, humidity sensor 2-5, heating coil
2-1 and humidifier 2-2, honeycomb structure 3, flowmeter 4, temperature sensor 2-4, humidity sensor 2-5 are installed in air pipeline
Interior, control panel 2-3 is mounted on outside pipeline and is connect by conducting wire with heating coil 2-1, humidifier 2-2, humidifier 2-2 installation
In the lower end heating coil 2-1, honeycomb structure 3, flowmeter 4, temperature sensor 2-4, humidity sensor 2-5 are sequentially arranged at heating
On rear side of coil 2-1, honeycomb structure 3 obtains the uniform damp-heat air of wind speed for rectifying to the air passed through, flowmeter 4,
Temperature sensor 2-4, humidity sensor 2-5 measure flow before air flows through 7 upper surface of porous material sample, temperature respectively
Degree, humidity, porous material sample 7 are mounted on air pipeline lower end and the air on rear side of its upper surface and humidity sensor 2-5
Inner wall of the pipe lower end is concordant, and hygrometer A5 is located at the upper surface of porous material sample 7, for measuring table on porous material sample 7
The hot-air humidity in face, hygrometer B9 are placed in pipeline exit, and measurement air flows through wet behind 7 upper surface of porous material sample
Degree, 7 side of porous material sample is wrapped up with insulation waterproof material 8, and is placed on bracket 12, and bracket 12, which is put into, fills thermostatted water
In sink B13, sink B13 is placed in sink A11, and constant temperature water tank 10 is for injecting thermostatted water, moisture sensing into sink B13
Device 6 is placed at 7 different height of porous material sample, for measuring the moisture content on different height, moisture transducer 6 and number
It is connected according to collection plate 14, data acquisition board 14 is connect with computer 15.
A kind of measuring method of the device of the steady state method measuring and calculating porous material mass tranfer coefficient, includes the following steps:
Step 1, it opens speed governing blast blower 1 and is adjusted to some gear, control panel 2-3 adjusts adding for heating coil 2-1
The humidity of hot temperature and humidifier 2-2, constant temperature water tank 10 are heated up to preset temperature value identical with temperature and humidity controller, and to water
Slot B13, which is constantly filled the water, makes it keep overflow status；
Step 2, to be seen to be surveyed to hygrometer A5 and hygrometer B9 and the 7 each moisture transducer 6 in inside of porous material sample
Moisture content it is constant when, in the reading and porous material sample 7 that read recording flowmeter 4, hygrometer A5 and hygrometer B9
The reading of each position moisture transducer 6 in portion；
Step 3, it using the resulting data of step 2, is calculated and is passed according to Fick's first law and the Newtonian Cooling formula of analogy
Matter coefficient,
Mass tranfer coefficient is divided into moisture diffusion coefficients and convective transfer coefficient, and specific calculating is as follows:
1) calculating of moisture diffusion coefficients
The moisture content gradient measured is,
Wherein, ρiFor corresponding position xiMoisture content, position xiIn position xi-1Top,
Due to reaching stable state, the moisture diffusion flux in each height of porous material sample 7 is identical, if the reading of flowmeter 4
Number is Q, unit m3The reading of/s, humidity sensor 2-5 and hygrometer B9 are respectively RH1And RH2, then on porous material sample 7
The corresponding moisture diffusion flux J in surface is,
Wherein, HSFor the saturated humidity ratio under corresponding temperature, unit g/m3, S is the 7 upper surface convection current of porous material sample
Mass transfer area,
In conjunction with formula (1) (2), moisture diffusion coefficients D can be calculated as,
2) calculating of convective transfer coefficient
Convective transfer coefficient hmIt can be calculated by the Newtonian Cooling formula of analogy,
Wherein J is the moisture diffusion flux in formula (2), ρSAnd ρ∞Respectively at 7 upper surface of porous material sample and sky
Gas passes through the moisture content before porous material sample 7, unit g/m3If the reading of hygrometer A5 is RH3, i.e. ρSAnd ρ∞It can divide
It is not calculated as,
ρS=HS·RH3 (5)
ρ∞=HS·RH1 (6)
So
The beneficial effects of the present invention are:
1, calculate under limit, the hesitation that occurs when unstable state can be overcome to calculate, measurement accuracy be not high to be lacked
The sample internal moisture concentration occurred in point and stable state agar diffusion method is not easy the shortcomings that measuring.
2, mass tranfer coefficient at different conditions can be calculated.Such as different material, different starting moisture concentrations, with
And different air physical parameter (including speed, temperature, humidity).
Detailed description of the invention
Fig. 1 is overall structure figure of the invention.
Each label in figure are as follows: 1- speed governing blast blower, 2-1 heating coil, 2-2 humidifier, 2-3 control panel, 2-4 temperature pass
Sensor, 2-5 humidity sensor composition, 3- honeycomb structure, 4- flowmeter, 5- hygrometer A, 6- moisture transducer, 7- porous material
Sample, 8- are insulated waterproof material, 9- hygrometer B, 10- constant temperature water tank, 11- sink A, 12- bracket, 13- sink B, 14- data
Collection plate, 15- computer.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the invention will be further described.
Embodiment 1: as shown in Figure 1, a kind of device of steady state method measuring and calculating porous material mass tranfer coefficient, including speed governing blast blower
1, temperature and humidity controller, honeycomb structure 3, flowmeter 4, hygrometer A5, moisture transducer 6, porous material sample 7, insulation waterproof
Material 8, hygrometer B9, constant temperature water tank 10, sink A11, bracket 12, sink B13, data acquisition board 14, computer 15；
The air outlet of the speed governing blast blower 1 is connected to air pipeline, and air is blasted air pipeline, temperature and humidity controller
It is made of heating coil 2-1, humidifier 2-2, control panel 2-3, temperature sensor 2-4, humidity sensor 2-5, heating coil
2-1 and humidifier 2-2, honeycomb structure 3, flowmeter 4, temperature sensor 2-4, humidity sensor 2-5 are installed in air pipeline
Interior, control panel 2-3 is mounted on outside pipeline and is connect by conducting wire with heating coil 2-1, humidifier 2-2, humidifier 2-2 installation
In the lower end heating coil 2-1, honeycomb structure 3, flowmeter 4, temperature sensor 2-4, humidity sensor 2-5 are sequentially arranged at heating
On rear side of coil 2-1, honeycomb structure 3 obtains the uniform damp-heat air of wind speed for rectifying to the air passed through, flowmeter 4,
Temperature sensor 2-4, humidity sensor 2-5 measure flow before air flows through 7 upper surface of porous material sample, temperature respectively
Degree, humidity, porous material sample 7 are mounted on air pipeline lower end and the air on rear side of its upper surface and humidity sensor 2-5
Inner wall of the pipe lower end is concordant, and hygrometer A5 is located at the upper surface of porous material sample 7, for measuring table on porous material sample 7
The hot-air humidity in face, hygrometer B9 are placed in pipeline exit, and measurement air flows through wet behind 7 upper surface of porous material sample
Degree, 7 side of porous material sample is wrapped up with insulation waterproof material 8, and is placed on bracket 12, and bracket 12, which is put into, fills thermostatted water
In sink B13, sink B13 is placed in sink A11, and constant temperature water tank 10 is for injecting thermostatted water, moisture sensing into sink B13
Device 6 is placed at 7 different height of porous material sample, for measuring the moisture content on different height, moisture transducer 6 and number
It is connected according to collection plate 14, data acquisition board 14 is connect with computer 15.
Air is blasted pipeline by speed governing blast blower 1, and the heating coil 2-1 and humidifier 2-2 of temperature and humidity controller are by air
It is rectified after warming and humidifying through honeycomb structure 3, obtains the uniform damp-heat air of wind speed.Flowmeter 4, temperature sensor 2-4, humidity pass
Sensor 2-5 is successively placed in the rear side of honeycomb structure 3, measure respectively flow before air flows through 7 upper surface of porous material sample,
Temperature, humidity.7 upper surface of porous material sample is concordant with air pipeline inner wall, and hygrometer A5 is placed on porous material sample 7
At upper surface, specimen surface hot-air humidity is measured.Hygrometer B9 is placed in air pipeline exit, and measurement air flows through porous
Humidity behind 7 upper surface of material sample.7 side of porous material sample is wrapped up with insulation waterproof material 8, and is placed on bracket 12.
Bracket 12 is put into the sink B13 wall for filling thermostatted water, and sink B13 is placed in sink A11.Thus it is able to maintain sample immersion
Constant depth in water.Moisture transducer 6 is placed at sample different height, measures the moisture content on different height.Moisture
Sensor 6 is connected with data acquisition board 14, and the data in data acquisition board 14 are imported computer 15.
A kind of measuring method of the device of the steady state method measuring and calculating porous material mass tranfer coefficient, includes the following steps:
Step 1, it opens speed governing blast blower 1 and is adjusted to some gear, control panel 2-3 adjusts adding for heating coil 2-1
The humidity of hot temperature and humidifier 2-2, constant temperature water tank 10 are heated up to preset temperature value identical with temperature and humidity controller, and to water
Slot B13, which is constantly filled the water, makes it keep overflow status；
Step 2, to be seen to be surveyed to hygrometer A5 and hygrometer B9 and the 7 each moisture transducer 6 in inside of porous material sample
Moisture content it is constant when, in the reading and porous material sample 7 that read recording flowmeter 4, hygrometer A5 and hygrometer B9
The reading of each position moisture transducer 6 in portion；
Step 3, it using the resulting data of step 2, is calculated and is passed according to Fick's first law and the Newtonian Cooling formula of analogy
Matter coefficient,
Mass tranfer coefficient is divided into moisture diffusion coefficients and convective transfer coefficient, and specific calculating is as follows:
1) calculating of moisture diffusion coefficients
The moisture content gradient measured is,
Wherein, ρiFor corresponding position xiMoisture content, position xiIn position xi-1Top,
Due to reaching stable state, the moisture diffusion flux in each height of porous material sample 7 is identical, if the reading of flowmeter 4
Number is Q, unit m3The reading of/s, humidity sensor 2-5 and hygrometer B9 are respectively RH1And RH2, then on porous material sample 7
The corresponding moisture diffusion flux J in surface is,
Wherein, HSFor the saturated humidity ratio under corresponding temperature, unit g/m3, S is the 7 upper surface convection current of porous material sample
Mass transfer area,
In conjunction with formula (1) (2), moisture diffusion coefficients D can be calculated as,
2) calculating of convective transfer coefficient
Convective transfer coefficient hmIt can be calculated by the Newtonian Cooling formula of analogy,
Wherein J is the moisture diffusion flux in formula (2), ρSAnd ρ∞Respectively at 7 upper surface of porous material sample and sky
Gas passes through the moisture content before porous material sample 7, unit g/m3If the reading of hygrometer A5 is RH3, i.e. ρSAnd ρ∞It can divide
It is not calculated as,
ρS=HS·RH3 (5)
ρ∞=HS·RH1 (6)
So
Specific embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned realities
Example is applied, it within the knowledge of a person skilled in the art, can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (2)
1. a kind of device of steady state method measuring and calculating porous material mass tranfer coefficient, it is characterised in that: including speed governing blast blower (1), warm and humid
Spend controller, honeycomb structure (3), flowmeter (4), hygrometer A (5), moisture transducer (6), porous material sample (7), insulation
Waterproof material (8), hygrometer B (9), constant temperature water tank (10), sink A (11), bracket (12), sink B (13), data acquisition board
(14), computer (15)；
The air outlet of the speed governing blast blower (1) is connected to air pipeline, and air is blasted air pipeline, temperature and humidity controller by
Heating coil (2-1), humidifier (2-2), control panel (2-3), temperature sensor (2-4), humidity sensor (2-5) composition,
Heating coil (2-1) and humidifier (2-2), honeycomb structure (3), flowmeter (4), temperature sensor (2-4), humidity sensor
(2-5) is installed in air pipeline, control panel (2-3) be mounted on pipeline it is outer and by conducting wire and heating coil (2-1) plus
Wet device (2-2) connection, humidifier (2-2) are mounted on the lower end heating coil (2-1), and honeycomb structure (3), flowmeter (4), temperature pass
Sensor (2-4), humidity sensor (2-5) are sequentially arranged on rear side of heating coil (2-1), and honeycomb structure (3) is used for passing through
Air is rectified, and the uniform damp-heat air of wind speed, flowmeter (4), temperature sensor (2-4), humidity sensor (2-5) are obtained
Measurement air flows through flow before porous material sample (7) upper surface, temperature, humidity, porous material sample (7) installation respectively
Air pipeline lower end and its upper surface it is concordant with the air pipeline inner wall lower end on rear side of humidity sensor (2-5), hygrometer A
(5) it is located at the upper surface of porous material sample (7), for measuring the hot-air humidity of porous material sample (7) upper surface, humidity
Meter B (9) is placed in pipeline exit, and measurement air flows through the humidity behind porous material sample (7) upper surface, porous material sample
(7) side insulation waterproof material (8) package, and be placed on bracket (12), bracket (12) is put into the sink B for filling thermostatted water
(13) in, sink B (13) is placed in sink A (11), and constant temperature water tank (10) is used to inject thermostatted water, water into sink B (13)
Sub-sensor (6) is placed at porous material sample (7) different height, for measuring the moisture content on different height, moisture
Sensor (6) is connect with data acquisition board (14), and data acquisition board (14) is connect with computer (15).
2. a kind of measuring method of the device of steady state method measuring and calculating porous material mass tranfer coefficient described in claim 1, feature exist
In: include the following steps:
Step 1, it opens speed governing blast blower (1) and is adjusted to some gear, control panel (2-3) adjusts heating coil (2-1)
The humidity of heating temperature and humidifier (2-2), constant temperature water tank (10) are heated up to preset temperature value identical with temperature and humidity controller,
And it is set to keep overflow status to sink B (13) constantly water filling；
Step 2, to be seen to hygrometer A (5) and the internal each moisture transducer of hygrometer B (9) and porous material sample (7)
(6) measure moisture content it is constant when, read recording flowmeter (4), the reading of hygrometer A (5) and hygrometer B (9) and porous
The reading of the internal each position moisture transducer (6) of material sample (7)；
Step 3, using the resulting data of step 2, mass transfer system is calculated according to Fick's first law and the Newtonian Cooling formula of analogy
Number,
Mass tranfer coefficient is divided into moisture diffusion coefficients and convective transfer coefficient, and specific calculating is as follows:
1) calculating of moisture diffusion coefficients
The moisture content gradient measured is,
Wherein, ρiFor corresponding position xiMoisture content, position xiIn position xi-1Top,
Due to reaching stable state, the moisture diffusion flux in porous material sample (7) each height is identical, if the reading of flowmeter (4)
Number is Q, unit m3The reading of/s, humidity sensor (2-5) and hygrometer B (9) are respectively RH1And RH2, then porous material sample
(7) the corresponding moisture diffusion flux J in upper surface is,
Wherein, HSFor the saturated humidity ratio under corresponding temperature, unit g/m3, S is porous material sample (7) upper surface to spreading
Matter area,
In conjunction with formula (1) (2), moisture diffusion coefficients D can be calculated as,
2) calculating of convective transfer coefficient
Convective transfer coefficient hmIt can be calculated by the Newtonian Cooling formula of analogy,
Wherein J is the moisture diffusion flux in formula (2), ρSAnd ρ∞Respectively at porous material sample (7) upper surface and air is logical
Cross the moisture content before porous material sample (7), unit g/m3If the reading of hygrometer A (5) is RH3, i.e. ρSAnd ρ∞It can divide
It is not calculated as,
ρS=HS·RH3 (5)
ρ∞=HS·RH1 (6)
So
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| CN110296492A (en) * | 2019-07-18 | 2019-10-01 | 无锡市凯灵电子有限公司 | A kind of constant temperature and humidity machine |
| ES2969662A1 (en) * | 2023-11-21 | 2024-05-21 | Univ Valencia Politecnica | MASS TRANSFER MEASURING DEVICE (Machine-translation by Google Translate, not legally binding) |
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| CN102507394A (en) * | 2011-11-17 | 2012-06-20 | 大连交通大学 | Method for measuring effective diffusion coefficient and porosity of porous medium |
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| WO2006025659A1 (en) * | 2004-08-06 | 2006-03-09 | Joo-Hwan Hwang | Cooker having deodorization device |
| JP6531476B2 (en) * | 2015-04-07 | 2019-06-19 | 東京電力ホールディングス株式会社 | Wetness measurement system and method |
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| CN102507394A (en) * | 2011-11-17 | 2012-06-20 | 大连交通大学 | Method for measuring effective diffusion coefficient and porosity of porous medium |
| CN103837568A (en) * | 2014-03-11 | 2014-06-04 | 中国矿业大学 | Multi-tube soil-air convection heat transfer test device |
| CN204302211U (en) * | 2014-12-31 | 2015-04-29 | 河海大学 | The experimental rig of a kind of simulated air flowing to material surface Heat Transfer Influence |
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