JP2008275364A - Fluid permeation state evaluation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply fluid containing at least liquid to one side of a measuring object and to observe and evaluate the state of the liquid flowing out of the other side. <P>SOLUTION: This fluid permeation state evaluation device 10 includes a holding section 14 for holding a porous body 12 as the measuring object, an inflow pipe 20 for supplying gas-liquid two-phase flow 21 as fluid containing at least liquid to the porous body 12, a transparent rotating plate 22, an imaging device 24 for imaging the lower surface of the porous body 12 via the transparent rotating plate 22, a driving section 26 for rotating the transparent rotating plate 22, and a wiping section 28 for wiping a droplet 31 adhering to the transparent rotating plate 22 after liquid flowing out of the porous body 12 drops as the droplet 30. These are arranged on a suitable measurement pedestal 11 to constitute the fluid permeation state evaluation device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid permeation state evaluation apparatus, and more particularly to a liquid permeation state evaluation apparatus that supplies a fluid containing at least a liquid to one side of a measurement object and observes and evaluates the state of the liquid flowing out from the other side.

  A porous body that is a porous substance having pores is used as a filtration layer, a diffusion layer, or the like. Since the porous body is solid and has pores, how the gas or liquid permeates depends on the characteristics of the porous body such as the porosity, the capillary pressure in the pores, and the moisture content. Therefore, in evaluating the porous body, it is also important to observe how the liquid and the like actually permeate and flow out in addition to the pressure loss when the fluid is permeated and permeated.

  For example, when a gas-liquid two-phase fluid in which gas and liquid are mixed flows through the porous body, the liquid passes through the porous body and flows out. Sexuality etc. can be evaluated. In order to observe how the fluid flows out, for example, it is conceivable to shoot with an imaging device. However, if the flowing fluid is directly received by the lens of the imaging device, the lens is covered with the fluid and sufficient imaging is performed. I can't. Therefore, it is conceivable to receive the fluid flowing out from a receiving tray such as an appropriate substrate and to take an image thereof.

  As for the observation of the fluid on the substrate, for example, Patent Document 1 discloses a method for inspecting the surface property of a glass substrate or the like used for mastering an optical disc. It is possible to mount a substrate horizontally on a spin table, supply liquid such as pure water from a nozzle while rotating it with a motor, stop the substrate after flying with centrifugal force, and photograph the surface with a camera It is stated.

Japanese Patent Laid-Open No. 9-236532

  In this way, the liquid state on the glass substrate can be photographed with a camera to know the state of the liquid. However, for example, when a gas-liquid two-phase fluid is supplied to the porous body that is the object to be measured, liquid comes out intermittently from the porous body. Therefore, even if the glass plate receives this and picks up an image, it cannot be fully evaluated how liquid accumulates on the glass plate and actually flows out of the porous body.

  If the surface of the measurement object is imaged through a transparent plate such as a glass plate, it is possible to directly observe how the fluid flows out of the measurement object. However, even in this case, the first outflow droplet can be observed when there is nothing on the transparent plate, but after that, the outflow droplets accumulate one after another, and the outflow of new droplets It becomes impossible to image the situation. Although it is possible to capture the state of flowing out obliquely from the bottom of the liquid droplet without using a transparent plate, it is not possible to observe the outflow state on the surface of the measurement object in detail. .

  An object of the present invention is to provide a liquid permeation state evaluation apparatus capable of supplying a fluid containing at least a liquid to one side of a measurement object and observing and evaluating the state of the liquid flowing out from the other side.

  The liquid permeation state evaluation apparatus according to the present invention includes a holding unit that holds a measurement object to which a fluid containing at least a liquid is supplied on one side surface and arranges the measurement object at an arbitrary arrangement position, a transparent rotating plate, and a measurement object A transparent rotating plate in which one side surface of the outer peripheral portion is spaced apart from the other side surface of the measurement object corresponding to the arrangement position of the object, and the other side surface of the transparent rotating plate corresponding to the arrangement position of the measurement object An image pickup means for picking up an image of the other side surface of the object to be measured via the transparent rotating plate, a driving means for rotating the transparent rotating plate under an arbitrary condition, and an outer peripheral portion of the transparent rotating plate. Wiping means, which is disposed on the downstream side of the rotation of the transparent rotator from the position where the measurement object is disposed, and includes wiping means for wiping off the liquid that has flowed out of the measurement object and adhered to the transparent rotating plate. It is characterized by that.

  Moreover, the liquid permeation state evaluation apparatus according to the present invention is provided as a fluid including at least a liquid, which is provided on one side surface of a porous body, a holding section that holds a porous body that is a measurement object and places the porous body at an arbitrary arrangement position. An inflow pipe for supplying a gas-liquid two-phase flow to the porous body, and a transparent rotating plate, and one side surface of the outer peripheral portion is disposed away from the other side surface of the porous body, corresponding to the position of the porous body Corresponding to the arrangement position of the transparent rotating plate, the transparent rotating plate, the imaging means arranged on the other side surface of the transparent rotating plate and imaging the other side surface of the porous body through the transparent rotating plate, and the transparent rotating plate under any condition And a wiping means disposed on one side surface of the outer peripheral portion of the transparent rotating plate, which is disposed on the downstream side of the rotation of the transparent rotating body from the position of the porous body and flows out of the porous body And wiping means for wiping off the liquid adhering to the transparent rotating plate. And wherein the Rukoto.

  Further, in the liquid permeation state evaluation device according to the present invention, the drive device continuously rotates the transparent rotating plate when a fluid containing at least a liquid is supplied to the measurement object, and the imaging device When a fluid containing at least a liquid is supplied to and the transparent rotating plate is continuously driven to rotate, it is preferable to perform continuous imaging.

  In the liquid permeation state evaluation apparatus according to the present invention, the holding unit holds both side surfaces of the measurement object in parallel in the horizontal direction, and a fluid containing at least a liquid is supplied to one side surface that is the upper surface of the measurement object. It is preferred that

  With the above configuration, the liquid permeation state evaluation device arranges the measurement object on the one side surface of the transparent rotating plate, arranges the imaging device on the other side surface, and rotates the transparent rotating plate by the driving device. Further, the transparent rotating plate wipes the liquid by the wiping means on the downstream side of the rotation where the imaging device is arranged. As a result, the liquid that has flowed out adheres to the transparent rotating plate, but the transparent rotating plate rotates, so the adhered liquid deviates from the field of view of the imaging device, and the portion of the transparent rotating plate to which no liquid is attached is the imaging device. Come around to the position. Therefore, even if the liquid flows out one after another, the liquid does not accumulate at the same place on the transparent rotating plate, and thus it is possible to evaluate the outflow state of the liquid that has passed through the measurement object using the imaging device. it can.

  In addition, even if the measurement object is a porous body and a fluid containing at least a liquid is a gas-liquid two-phase flow, the outflow state of the gas-liquid two-phase flow in the porous body can be similarly evaluated using the imaging device. .

  Further, in the liquid permeation state evaluation device, when a fluid containing at least a liquid is supplied to the measurement object, the driving device continuously rotates the transparent rotating plate, and the imaging device continuously Take an image. Therefore, the imaging apparatus can perform imaging one after another through the transparent rotating plate to which no liquid is attached.

  In the liquid permeation state evaluation apparatus, both side surfaces of the measurement object are held in parallel in the horizontal direction, and a fluid containing at least liquid is supplied to one side surface that is the upper surface of the measurement object. Thereby, the fluid flowing out from the measurement object falls in the direction of gravity, and the outflow state of the fluid from the measurement object can be observed in a natural state as compared with the case where the measurement object is arranged obliquely.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a film-like porous body will be described as an object to be measured. However, this is only an example for description, and any material that transmits liquid can be used. For example, the porous material having pores may be a porous membrane or a porous sintered material, a semipermeable membrane, a hollow fiber, and the like. Moreover, although the gas-liquid two-phase fluid comprised from air and water is demonstrated as a fluid supplied to a measuring object, it should just be a fluid containing a liquid at least. For example, in a gas-liquid two-phase fluid, the gas may be a gas other than air, and the liquid may be other than water. Moreover, the fluid containing solids, such as microparticles | fine-particles, soil, sand, and garbage, may be sufficient. In addition, the materials and the like in the following are examples for explanation, and can be appropriately changed according to the type of the measurement object, the type of fluid to be supplied, and the like.

  FIG. 1 is a perspective view showing the configuration of the liquid permeation state evaluation apparatus 10, and FIG. 2 is a side view showing the liquid permeation state evaluation apparatus 10 in a partial cross-sectional view. The liquid permeation state evaluation device 10 is a device for supplying a fluid containing at least a liquid to a measurement object and observing and evaluating the outflow state of the liquid that permeates the measurement object. A liquid permeation state evaluation apparatus 10 shown in FIGS. 1 and 2 uses a porous body 12 as a measurement object and supplies a gas-liquid two-phase flow composed of air and water as a fluid containing at least a liquid. It has a function to evaluate the outflow state of gas-liquid two-phase flow in the body.

  The liquid permeation state evaluation apparatus 10 includes a holding unit 14 that holds a porous body 12 that is a measurement object, an inflow pipe 20 that supplies a gas-liquid two-phase flow 21 to the porous body 12, a transparent rotating plate 22, and a transparent rotation. An imaging device 24 that images the porous body 12 through the plate 22, a drive unit 26 that rotates the transparent rotating plate 22, and a wiping unit 28 that wipes out the liquid that has flowed out of the porous body 12 and adhered to the transparent rotating plate 22. These are arranged and arranged on a suitable measuring table 11.

  The porous body 12 as a measurement object is a thin film made of a substance having pores and having a property of transmitting gas and liquid.

  The holding unit 14 has a function of holding the porous body 12 as a measurement object and arranging the porous body 12 at an arbitrary arrangement position. The holding unit 14 has two annular holding plates 13 and 15 having a central opening, and a seal ring. 16 and a fastening member 18 composed of bolts and nuts for fixing the two holding plates 13 and 15 together. The two holding plates 13 and 15 are preferably made of a transparent material so that the state of the fluid can be observed. For example, an acrylic resin or the like processed into an annular shape can be used.

  The size of the porous body 12 is set to be smaller than the size of the annular central opening of the holding portion 14. Then, the porous body 12 is disposed and sandwiched between the two annular holding plates 13 and 15 so as to close the annular central opening, and is made of a bolt and a nut while using an appropriate seal ring 16. The porous body 12 is held by the holding portion 14 by being fixed by the fastening member 18.

  The holding part 14 is fixed to the measuring table 11 by an attaching part (not shown), and its arrangement position is set. The arrangement position is set as follows. First, the holding unit 14 is attached to the measurement table 11 such that both side surfaces of the porous body 12 are parallel to the horizontal direction. Next, the holding unit 14 is attached to the measurement table 11 so that the porous body 12 is disposed on the upper surface side of the transparent rotating plate 22. Furthermore, the holding part 14 is attached to the measurement table 11 so that the porous body 12 is disposed not at the center part of the transparent rotating plate 22 but at the outer peripheral part.

  The inflow pipe 20 is a supply pipe that is disposed on the upper surface of the holding unit 14 and supplies the gas-liquid two-phase flow 21 to the porous body 12. The other end of the inflow pipe 20 is connected to a gas-liquid supply unit (not shown), and one end is in contact with the upper surface of the holding unit 14 or the upper surface of the porous body 12 attached and fixed to the holding unit 14. Be placed. That is, the central axis of the inflow pipe 20 is arranged to be perpendicular to the upper surface of the porous body 12. The portion where the one end of the inflow pipe 20 is in contact with the holding portion 14 or the porous body 12 is preferably sealed with an appropriate material so that the gas-liquid two-phase flow 21 does not leak.

  The inflow pipe 20 is also preferably made of a transparent material so that the fluid state can be observed. For example, a transparent pipe made of a glass tube or an acrylic resin can be used. An outflow pipe 29 corresponding to the inflow pipe 20 is also provided on the lower surface side of the holding portion 14. The inflow pipe 20 is arranged by being attached to the measurement table 11 using an attachment portion (not shown). However, as described above, the inflow pipe 20 needs to be arranged in close contact with the holding portion 14 or the porous body 12. Therefore, it may be attached to the measurement table 11 so as to be integrated with the holding unit 14.

  The gas-liquid two-phase flow is a mixed fluid of air and water. Specifically, the flow of dry air and the flow of water are individually supplied to the other end of the inflow pipe 20 and merge in the inflow pipe 20 to form a gas-liquid two-phase flow. At the end, it is supplied to the upper surface side of the porous body 12. Of course, air and water may be merged outside the inflow pipe 20 and supplied to the other end of the inflow pipe 20 as a gas-liquid two-phase flow. The gas-liquid two-phase flow 21 supplied to the upper surface side of the porous body 12 passes through the pores inside the porous body 12 and permeates the lower surface side of the porous body 12. How the gas air and the liquid water permeate and flow out from the lower surface side greatly depends on the characteristics of the porous body 12, such as the porosity, the capillary pressure in the pores, and the moisture content.

  The transparent rotating plate 22 is arranged between the lower surface side of the porous body and the upper surface side of the imaging device 24 so that the state of the liquid flowing out of the porous body 12 can be photographed by the imaging device 24 from the lower surface side of the porous body 12. It is the transparent disk arrange | positioned spaced apart from each. The axial direction of the rotating shaft of the transparent rotating plate 22 is parallel to the axial direction of the central axis of the inflow pipe 20 and is perpendicular to both side surfaces of the porous body 12. That is, the transparent rotating plate 22 rotates in a plane parallel to both side surfaces of the porous body 12. And as above-mentioned, the porous body 12 is arrange | positioned not in the center part of the transparent rotation board 22, but in the position of an outer peripheral part. As the transparent rotating plate 22, a plastic disk made of a transparent resin material such as a glass disk or an acrylic resin can be used.

  The imaging device 24 is an imaging device having a function of imaging the outflow state of the liquid that passes through the porous body 12 and flows out from the lower surface side thereof. The optical axis of the imaging device 24 is positioned so that it is perpendicular to the lower surface of the porous body 12 and the center of the optical axis is at the center of the porous body 12. That is, the imaging device 24 is disposed on the measurement table 11 so as to photograph the lower surface of the porous body 12 from directly below the porous body 12 via the transparent rotating plate 22.

  The liquid flowing out of the porous body 12 becomes droplets due to gravity and falls on the upper surface of the transparent rotating plate 22, but in some cases, the droplets drop at a frequency of several drops per second. Therefore, in order to observe and evaluate this state, the imaging device 24 is preferably a device capable of appropriate high-speed continuous shooting. As the imaging device 24, a high-speed digital camera with an image memory or the like can be used.

  The drive unit 26 is a drive control circuit that rotationally drives the transparent rotating plate 22 under an arbitrary rotation condition. The rotation condition is set according to the shutter speed of the imaging device 24 or the number of image frames per second during continuous imaging. The rotation condition may be an arbitrary constant rotation speed, or may be a rotation speed profile programmed to allow arbitrary acceleration and deceleration. The drive unit 26 can be configured to include a small motor whose rotation speed is variable, a motor drive circuit, a control circuit for controlling the drive circuit, and the like. In this case, the output shaft of the small motor is connected to the rotating shaft of the transparent rotating plate 22.

  The drive unit 26 is connected to the imaging device 24 with a signal cable, and the transparent rotating plate 22 can be rotationally driven in conjunction with the imaging conditions of the imaging device 24 as described above. Further, it is connected to a control unit of a gas-liquid supply unit (not shown), and the transparent rotating plate 22 is rotated in synchronization with the supply of the gas-liquid two-phase flow, and the imaging device 24 is operated in accordance with this. You can also. That is, when the gas-liquid two-phase flow is supplied to the porous body 12, the drive unit 26 continuously rotates the transparent rotating plate 22, and the imaging device 24 continuously performs imaging at this time. can do.

  The wiping unit 28 has a function of wiping off the liquid that has flowed out of the porous body 12 and adhered to the transparent rotating plate 22. The wiping unit 28 is disposed in contact with the upper surface of the transparent rotating plate 22. The arrangement position is set such that the droplets that have flowed out of the porous body 12 and dropped onto the transparent rotating plate 22 are rotated away from the arrangement position of the porous body 12 by the rotation of the transparent rotating plate 22. The That is, the wiping unit 28 is disposed at a position where the liquid flowing out of the porous body 12 and adhering to the transparent rotating plate 22 can be wiped downstream of the rotation position of the transparent rotating plate 22 relative to the position where the porous body 12 is disposed. . The simplest arrangement position is a position that is symmetrical with respect to the arrangement position of the porous body 12 with the central axis of the transparent rotating plate 22 as the axis of symmetry. As the wiping portion 28, a liquid absorbent material such as an appropriate cloth material can be used.

  The operation of the liquid permeation state evaluation apparatus 10 having such a configuration will be described. Hereinafter, description will be made with reference to FIGS. 1 and 2 and the reference numerals in FIGS. In the liquid permeation state evaluation device 10, the holding unit 14, the inflow pipe 20, the transparent rotating plate 22, the imaging device 24, the driving unit 26, and the wiping unit 28 are positioned and arranged in advance on the measurement table 11. . Therefore, the holding unit 14 and the inflow pipe 20 are removed from the measurement table 11, and the porous body 12 as the measurement object is attached to the holding unit 14. Then, the inflow pipe 20 is arranged so as to be in contact with the holding portion 14 or the porous body 12, and these are again attached to the measurement table 11 as a predetermined arrangement position.

  And the drive part 26 is operated, the transparent rotating plate 22 is rotated, the gas-liquid supply apparatus which is not shown in figure is operated, and the gas-liquid two-phase flow 21 is supplied to the inflow tube 20. As a result, the gas-liquid two-phase flow 21 supplied to the upper surface side of the porous body 12 passes through the pores inside the porous body 12 and permeates the lower surface side of the porous body 12. As shown in FIG. 1, the permeated liquid leaves the lower surface of the porous body 12 due to gravity and becomes a droplet 30, and adheres to the upper surface of the transparent rotating plate 22. At this time, if the image pickup device 24 is operated, it is possible to take an image of the liquid that permeates through the porous body 12, flowing out to the lower surface of the porous body 12, forming the droplet 30, and the like. . The captured image is stored in a memory and can be analyzed in detail thereafter.

  The droplet 31 attached to the upper surface of the transparent rotating plate 22 moves downstream with the rotation of the transparent rotating plate 22 and moves away from the arrangement position of the porous body 12, that is, the imaging position of the imaging device 24. Then, it is absorbed and wiped off by the wiping portion 28 disposed on the downstream side of the rotation of the transparent rotating plate 22 and removed from the upper surface of the transparent rotating plate 22. Therefore, when the transparent rotating plate 22 further rotates and returns to the original imaging position, even if the adhered droplet 31 is removed cleanly and the droplet 30 newly falls from the porous body 12, the imaging device 24. Can take an image without being affected by the droplet 31 previously attached. In this way, even if the droplets 30 flowing out of the porous body 12 are continuous, by setting the number of rotations of the transparent rotating plate 22 appropriately, it is not hindered by the droplets that have fallen before, The imaging device 24 can perform imaging continuously.

  FIGS. 3 and 4 are examples of a screen imaged by the imaging device 24, FIG. 3 is an imaging screen when the transparent rotating plate 22 is not rotated, and FIG. 4 is an imaging screen when the transparent rotating plate 22 is rotated. It is. In FIGS. 3 and 4, the elements shown in the respective imaging screens are denoted by the corresponding element symbols in FIGS. 1 and 2. Hereinafter, description will be made using the reference numerals in FIGS.

  In the imaging screen of FIG. 3, since the transparent rotating plate 22 is not rotated, droplets are successively dropped on the transparent rotating plate 22 and are connected to each other to form a liquid film 32. ing. Therefore, the state of the liquid newly flowing out of the porous body 12 due to the liquid film 32 is hardly recognized.

  In the imaging screen of FIG. 4, since the transparent rotating plate 22 is rotating, the old droplets adhering to the transparent rotating plate 22 have moved away from the imaging range, and the lower surface of the porous body 12 passes through the clean transparent rotating plate 22. Can be imaged. That is, as shown in FIG. 4, the droplet 30 falling from the porous body 12 is accurately imaged. From this, it can be seen that in the example of FIG. 4, the liquid that permeates the porous body 12 does not evenly flow out evenly over the surface of the porous body 12 but flows out in a granular form.

It is a perspective view which shows the structure of the liquid permeation | transmission state evaluation apparatus in embodiment which concerns on this invention. It is a side view shown with a partial sectional view about a liquid permeation state evaluation device in an embodiment concerning the present invention. It demonstrates the effect | action of the liquid permeation | transmission state evaluation apparatus in embodiment which concerns on this invention, and is an imaging screen when not rotating a transparent rotating plate. It demonstrates the effect | action of the liquid permeation | transmission state evaluation apparatus in embodiment which concerns on this invention, and is an imaging screen when rotating a transparent rotating plate.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Liquid permeation | transmission state evaluation apparatus, 11 Measurement stand, 12 Porous body, 13, 15 Holding plate, 14 Holding part, 16 Seal ring, 18 Fastening member, 20 Inflow pipe, 21 Gas-liquid two-phase flow, 22 Transparent rotary plate, 24 Imaging device, 26 driving unit, 28 wiping unit, 30, 31 droplet, 32 liquid film.

Claims (4)

A holding unit that holds a measurement object to which a fluid containing at least a liquid is supplied to one side surface and arranges the measurement object at an arbitrary arrangement position;
A transparent rotating plate, wherein the one side surface of the outer peripheral portion is spaced apart from the other side surface of the measuring object, corresponding to the arrangement position of the measuring object;
Corresponding to the arrangement position of the measurement object, the imaging means is arranged on the other side surface of the transparent rotating plate and images the other side surface of the measuring object through the transparent rotating plate;
Driving means for rotating the transparent rotating plate under arbitrary conditions;
A wiping means disposed on one side surface of the outer peripheral portion of the transparent rotating plate, disposed on the downstream side of the rotation of the transparent rotating body from the position of the measuring object, and flows out of the measuring object and passes through the transparent rotating plate Wiping means for wiping off the liquid adhering to
A liquid permeation state evaluation apparatus comprising: A holding unit that holds the porous body that is the measurement object and places the porous body in an arbitrary arrangement position;
An inflow pipe that is provided on one side surface of the porous body and supplies a gas-liquid two-phase flow to the porous body as a fluid containing at least a liquid;
A transparent rotating plate, wherein the one side surface of the outer peripheral portion is spaced apart from the other side surface of the porous body, corresponding to the arrangement position of the porous body,
Corresponding to the arrangement position of the porous body, the imaging means is disposed on the other side surface of the transparent rotating plate and images the other side surface of the porous body through the transparent rotating plate;
Driving means for rotating the transparent rotating plate under arbitrary conditions;
Wiping means disposed on one side of the outer peripheral portion of the transparent rotating plate, disposed on the downstream side of the rotation of the transparent rotating body from the position of the porous body, and flows out of the porous body and adheres to the transparent rotating plate Wiping means for wiping off the liquid,
A liquid permeation state evaluation apparatus comprising: In the liquid permeation state evaluation apparatus according to claim 1 or 2,
The driving device continuously rotates the transparent rotating plate when a fluid containing at least a liquid is supplied to the measurement object,
The imaging apparatus continuously performs imaging when a fluid containing at least a liquid is supplied to an object to be measured and the transparent rotating plate is continuously driven to rotate. In the liquid permeation state evaluation apparatus according to claim 1 or 2,
The holding part holds both sides of the measurement object parallel to the horizontal direction,
A fluid permeation state evaluation apparatus, wherein a fluid containing at least a liquid is supplied to one side surface which is an upper surface of a measurement object.

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