JP2002130975A - Method for heat-transfer augmentation by using metal thin-wire porous body - Google Patents
Method for heat-transfer augmentation by using metal thin-wire porous bodyInfo
- Publication number
- JP2002130975A JP2002130975A JP2000330287A JP2000330287A JP2002130975A JP 2002130975 A JP2002130975 A JP 2002130975A JP 2000330287 A JP2000330287 A JP 2000330287A JP 2000330287 A JP2000330287 A JP 2000330287A JP 2002130975 A JP2002130975 A JP 2002130975A
- Authority
- JP
- Japan
- Prior art keywords
- porous body
- heat
- wire
- fluid
- heat transfer
- 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
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明、現在工業プラントな
どで多数利用されている伝熱促進法に関するものであ
る。特に、本発明は、金属を細線化して高い空隙率を持
つ多孔体を形成し、これを流路内に挿入することで流路
壁面を加工することなく流体と流路壁間の熱交換を促進
できる方法である。本発明は、具体的には円形や矩形管
などの様々な流路内に挿入して熱交換の促進に使用され
るほか、ヘリウムガス加熱による水蒸気改質器触媒管の
伝熱促進として利用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for promoting heat transfer which is currently used in many industrial plants and the like. In particular, the present invention forms a porous body having a high porosity by thinning a metal, and by inserting this into a flow path, heat exchange between the fluid and the flow path wall without processing the flow path wall surface. It is a way that can be promoted. The present invention is specifically used to promote heat exchange by being inserted into various flow paths such as circular and rectangular tubes, and is also used to promote heat transfer of a steam reformer catalyst tube by helium gas heating. You.
【0002】[0002]
【従来の技術】従来の技術においては、流路内壁に流れ
と直交あるいは平行にフィン等の突起物を取り付けて伝
熱を促進する方法やねじれテープを挿入して伝熱促進を
行うものがある。2. Description of the Related Art In the prior art, there is a method in which a protrusion such as a fin is attached to an inner wall of a flow path in a direction orthogonal or parallel to a flow to promote heat transfer, or a method in which a twisted tape is inserted to promote heat transfer. .
【0003】[0003]
【発明が解決しようとする課題】従来の伝熱促進法では
円管や矩形管の内壁に突起物を溶接したり、壁面を加工
したりすることが容易でないという欠点があった。ま
た、突起物を溶接した流路の溶接検査が必要な場合に
は、溶接部の検査が困難であるという欠点があった。The conventional heat transfer enhancement method has a disadvantage that it is not easy to weld a projection to the inner wall of a circular tube or a rectangular tube or to machine the wall surface. In addition, when welding inspection of the flow path where the projection is welded is required, there is a disadvantage that it is difficult to inspect the welded portion.
【0004】[0004]
【課題を解決するための手段】本発明は、これらの従来
技術の問題点を解決して画期的な伝熱促進技術を実現す
るために、金属を細線化した高い空隙率を持つ多孔体を
利用して伝熱を促進する方法を考案したものである。SUMMARY OF THE INVENTION In order to solve the problems of the prior art and realize a revolutionary heat transfer enhancement technique, the present invention provides a porous body having a high porosity obtained by thinning a metal. A method of promoting heat transfer by utilizing the method has been devised.
【0005】即ち、本発明においては、従来の伝熱促進
のために流路内に設けられるフィン等の突起物、又はね
じれテープに代えて、特定の金属を細線化して高い空隙
率を持つ細線多孔体を形成し、これを加熱または冷却さ
れる流路内に挿入し、流路内に流体を流して多孔体を含
めた流路の固体壁と流体間で熱交換させる伝熱促進法で
あり、その細線としては銅線、ステンレス線等が使用さ
れ、その流体としてはヘリウム、水蒸気等が使用され
る。That is, in the present invention, instead of a conventional projection such as a fin or a twisted tape provided in a flow path for promoting heat transfer, a thin wire having a high porosity is formed by thinning a specific metal. By forming a porous body, inserting it into the flow path to be heated or cooled, flowing fluid through the flow path, and exchanging heat between the fluid and the solid wall of the flow path including the porous body by a heat transfer promotion method There are copper wires, stainless steel wires and the like as the fine wires, and helium, water vapor and the like as the fluid.
【0006】[0006]
【発明の実施の形態】高い空隙率を持つ金属細線の多孔
体の製作は、円管流路の場合を例にすると以下のように
なる。直径0.5mm程度の細線を網状にしたもので流
路内に挿入可能な円筒状の物を製作し、この中に金属細
線を束子状あるいはらせん状にして挿入する。空隙率は
円筒状物の製作に要した細線の体積とその中に挿入する
束子状の細線の直径と長さから計算できるので、挿入す
る細線の直径や長さを調節して空隙率を設定する。この
ような多孔体をあらかじめ製作して必要なだけ流路内に
挿入することで、その流路に適した熱伝達と圧力損失を
持つ流路を構成することができる。圧力損失低減の観点
から空隙率は0.9以上が適当であると考えられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The production of a porous body of a fine metal wire having a high porosity is as follows, taking the case of a circular channel as an example. A cylindrical object that can be inserted into the flow path is manufactured by forming a thin wire having a diameter of about 0.5 mm into a net shape, and a metal thin wire is inserted into the bundle in a spiral or spiral shape. The porosity can be calculated from the volume of the thin wire required for manufacturing the cylindrical object and the diameter and length of the bundled wire inserted into it, so the porosity is set by adjusting the diameter and length of the inserted thin wire I do. By fabricating such a porous body in advance and inserting it into the flow passage as needed, a flow passage having heat transfer and pressure loss suitable for the flow passage can be formed. It is considered that a porosity of 0.9 or more is appropriate from the viewpoint of reducing pressure loss.
【0007】図1の本発明の水平円形流路管の伝熱にお
いては、束子状金属細線が挿入された円形管内に流体を
流入し、その管壁の周囲から加熱すると、その流入流体
は加熱され、流路管は冷却される。図2の本発明の鉛直
片面加熱正方形流路管の伝熱においては、束子状金属細
線が挿入された正方形管内に流体を流入させ、その管壁
の一面を加熱し、他面を断熱すると、流入流体は加熱さ
れ、加熱面は冷却される。図3の本発明の周囲が断熱さ
れた環状流路管の伝熱においては、束子状金属細線が挿
入された環状流路管の外管側に高温流体を流入させ、そ
の環状流路管の内管側に低温流体を流すと、環状流路管
の外管側を流れる高温流体が金属細線を加熱し、これに
より環状流路の内管を加熱し、そこを流れる低温流体が
加熱される。In the heat transfer of the horizontal circular flow pipe of the present invention shown in FIG. 1, when a fluid flows into a circular pipe into which a bundle of bundled metal wires is inserted and is heated from around the pipe wall, the flowing fluid is heated. Then, the flow pipe is cooled. In the heat transfer of the vertical single-sided heated square flow channel tube of the present invention in FIG. The incoming fluid is heated and the heated surface is cooled. In the heat transfer of the annular flow path pipe of the present invention in FIG. When a low-temperature fluid flows through the inner pipe, the high-temperature fluid flowing on the outer pipe side of the annular flow path pipe heats the thin metal wire, thereby heating the inner pipe of the annular flow path, and the low-temperature fluid flowing there is heated. .
【0008】[0008]
【実施例】図1のように特定金属(例えば、銅やステン
レス等)を細線化(1.0mm以下が適当)したものを
多孔体として円管流路内に挿入し、水平円管を周囲から
加熱して流体を流して除熱する。あるいは図2のように
片面から加熱された鉛直正方形流路内に金属細線の多孔
体を挿入し、流体を流して除熱する。図3は加熱した流
体を環状流路部に流して内管の管壁を加熱し、そこを流
れる流体を加熱する方法である。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a specific metal (for example, copper or stainless steel) thinned (appropriately 1.0 mm or less) is inserted into a circular pipe flow path as a porous body, and a horizontal circular pipe is surrounded by To remove the heat by flowing the fluid. Alternatively, as shown in FIG. 2, a porous body of a thin metal wire is inserted into a vertical square channel heated from one side, and a fluid is flown to remove heat. FIG. 3 shows a method in which a heated fluid is caused to flow through an annular flow passage to heat the inner wall of the inner tube and heat the fluid flowing therethrough.
【0009】以下に、周囲から加熱された水平円管内に
細線状の金属銅線を挿入し、空気の強制対流により冷却
した場合の除熱量の変化を例に説明する。空隙率は圧力
損失を小さく抑えるという観点から0.993以上の場
合について実施したものである。図4には本方法を用い
た場合に円管からの除熱量が増大する効果を示す。横軸
は加熱入力で、縦軸は本発明の方法による金属細線を円
管内に挿入した場合の熱量を流路内に何も挿入しない場
合の除熱量で除した値である。The following describes, as an example, a change in the amount of heat removal when a thin metallic copper wire is inserted into a horizontal circular tube heated from the surroundings and cooled by forced convection of air. The porosity was measured in the case of 0.993 or more from the viewpoint of suppressing pressure loss. FIG. 4 shows the effect of increasing the amount of heat removed from a circular tube when this method is used. The horizontal axis is the heating input, and the vertical axis is the value obtained by dividing the amount of heat when a thin metal wire according to the method of the present invention is inserted into a circular tube by the amount of heat removal when nothing is inserted into the flow path.
【0010】熱入力が約320Wの場合では管壁の最高
温度が約160℃まで上昇し、本発明の方法による除熱
量が平滑面を持つ円管の場合に比べて20%以上増大し
たことがわかる。さらに、熱入力の増大に対しては除熱
量の増大効果が大きくなっていることから、加熱面が高
温になればさらに熱放射による伝熱効果が大きくなり、
除熱量も増大することが予想される。When the heat input is about 320 W, the maximum temperature of the tube wall rises to about 160 ° C., and the amount of heat removed by the method of the present invention is increased by 20% or more as compared with the case of a circular tube having a smooth surface. Understand. Furthermore, since the effect of increasing the amount of heat removal is increased with respect to the increase in heat input, the higher the heating surface becomes, the more the heat transfer effect by heat radiation increases.
It is expected that the heat removal will also increase.
【0011】[0011]
【発明の効果】本発明は伝熱面を加工しないため、突起
物による伝熱促進などの従来の方法に比べて、加工に伴
う溶接部の検査や伝熱面の構造強度の低下も考慮する必
要がなく、経済的に優れている。According to the present invention, since the heat transfer surface is not processed, the inspection of the welded portion and the reduction in the structural strength of the heat transfer surface due to the processing are considered in comparison with the conventional method of promoting heat transfer by a projection. No need, it is economically good.
【0012】又、金属細線の多孔体を用いた伝熱促進法
は、平滑面に比べて高い熱伝達率を持つ円柱に対する伝
熱面積が増大することで、表面積の増大による摩擦損失
は増大するけれども、加熱面と金属細線面からの熱伝達
量は大きくなるので、従来の伝熱促進法に比べても伝熱
性能は同等以上である。さらに、流体が気体の場合は高
温条件下で熱放射による伝熱効果が大きくなるため、熱
伝達性能がさらに向上更に又、流路内に空隙率や材質の
異なる多孔体をあらかじめ製作しておくことで、流路全
体の熱伝達や圧力損失を容易に変化させることができ
る。In the heat transfer promoting method using a porous metal thin wire, the heat transfer area to a cylinder having a higher heat transfer coefficient than that of a smooth surface increases, so that the friction loss due to the increase of the surface area increases. However, since the amount of heat transfer from the heating surface and the thin metal wire surface is large, the heat transfer performance is equal to or higher than that of the conventional heat transfer enhancement method. Further, when the fluid is a gas, the heat transfer effect by heat radiation is increased under high temperature conditions, so that the heat transfer performance is further improved. Further, a porous body having a different porosity or a different material is previously manufactured in the flow path. This makes it possible to easily change the heat transfer and the pressure loss of the entire flow channel.
【図1】従来の水平円形流路、及び本発明における金属
細線多孔体を挿入した水平円形流路の伝熱促進を示す図
である。FIG. 1 is a diagram showing the promotion of heat transfer in a conventional horizontal circular channel and a horizontal circular channel in which a porous metal thin body according to the present invention is inserted.
【図2】本発明における鉛直片面加熱正方形流路の伝熱
促進を示す図である。FIG. 2 is a diagram showing the promotion of heat transfer in a vertically heated single-sided square channel in the present invention.
【図3】本発明における環状流路の伝熱促進を示す図で
ある。FIG. 3 is a diagram showing heat transfer promotion of an annular flow channel in the present invention.
【図4】本発明のおける金属細線多孔体を水平円管流路
内に挿入した場合の除熱量増大効果を示す図である。FIG. 4 is a diagram showing the effect of increasing the amount of heat removal when a porous metal thin wire according to the present invention is inserted into a horizontal circular channel.
Claims (1)
つ細線多孔体を形成し、これを加熱または冷却される流
路内に挿入し、流路内に流体を流して多孔体を含めた流
路の固体壁と流体間で熱交換させることを特徴とする伝
熱促進法。A thin metal porous body having a high porosity is formed by thinning a specific metal, inserted into a flow path to be heated or cooled, and a fluid is caused to flow through the flow path to include the porous body. Heat transfer between the solid wall of the flow channel and the fluid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2000330287A JP2002130975A (en) | 2000-10-30 | 2000-10-30 | Method for heat-transfer augmentation by using metal thin-wire porous body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000330287A JP2002130975A (en) | 2000-10-30 | 2000-10-30 | Method for heat-transfer augmentation by using metal thin-wire porous body |
Publications (1)
Publication Number | Publication Date |
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JP2002130975A true JP2002130975A (en) | 2002-05-09 |
Family
ID=18806837
Family Applications (1)
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JP2000330287A Pending JP2002130975A (en) | 2000-10-30 | 2000-10-30 | Method for heat-transfer augmentation by using metal thin-wire porous body |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150267765A1 (en) * | 2012-11-05 | 2015-09-24 | University Of The Witwatersrand, Johannesburg | Mechanical friction device including a porous core |
JP2018025345A (en) * | 2016-08-09 | 2018-02-15 | 株式会社システック | Heat exchanger |
JP2018535386A (en) * | 2015-11-16 | 2018-11-29 | ジニー エンタープライズ リミティッド | Equipment for rapid heating of liquids |
JP2020125864A (en) * | 2019-02-02 | 2020-08-20 | 昭二 酒井 | Three dimensional solid body element for promoting heat transfer and heat exchanger inserting the element inside heat transfer pipe |
JP7163525B1 (en) * | 2022-03-30 | 2022-10-31 | 浩明 北原 | Additional heating device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04503919A (en) * | 1988-11-28 | 1992-07-16 | シッテン・フルーイド・テクノロジー・リミテッド | container packing |
-
2000
- 2000-10-30 JP JP2000330287A patent/JP2002130975A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04503919A (en) * | 1988-11-28 | 1992-07-16 | シッテン・フルーイド・テクノロジー・リミテッド | container packing |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150267765A1 (en) * | 2012-11-05 | 2015-09-24 | University Of The Witwatersrand, Johannesburg | Mechanical friction device including a porous core |
JP2018535386A (en) * | 2015-11-16 | 2018-11-29 | ジニー エンタープライズ リミティッド | Equipment for rapid heating of liquids |
US11162708B2 (en) | 2015-11-16 | 2021-11-02 | Genie Enterprise Ltd. | Apparatus for rapid heating of liquids |
JP2018025345A (en) * | 2016-08-09 | 2018-02-15 | 株式会社システック | Heat exchanger |
JP2020125864A (en) * | 2019-02-02 | 2020-08-20 | 昭二 酒井 | Three dimensional solid body element for promoting heat transfer and heat exchanger inserting the element inside heat transfer pipe |
JP7079395B2 (en) | 2019-02-02 | 2022-06-02 | 昭二 酒井 | A three-dimensional three-dimensional element for promoting heat transfer and a heat exchanger in which the element is inserted inside a heat transfer tube. |
JP7163525B1 (en) * | 2022-03-30 | 2022-10-31 | 浩明 北原 | Additional heating device |
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