Pressure loss characteristics of a circular pipe that inserted with thin copper wire with high porosity

2019 ◽  
Vol 2019 (0) ◽  
pp. S08115
Author(s):  
Daichi SAMPEI ◽  
Tetsuaki TAKEDA
Keyword(s):  
Pressure Loss ◽  
Copper Wire ◽  
Circular Pipe ◽  
High Porosity

scholarly journals Investigation of pressure loss in a circular pipe under ultrasonic waves released along main stream flow

2021 ◽  
Vol 1137 (1) ◽  
pp. 012064
Author(s):  
Pongsapak Treegosol ◽  
Jetsadaporn Priyadumkol ◽  
Kanet Katchasuwanmanee ◽  
Weerachai Chaiworapuek
Keyword(s):  
Pressure Loss ◽  
Stream Flow ◽  
Ultrasonic Waves ◽  
Circular Pipe ◽  
Main Stream

Heat Transfer Characteristics of a Circular Channel Inserted Metallic Wire With High Porosity

2010 ◽  
Author(s):  
Mitsutoshi Tendo ◽  
Tetsuaki Takeda
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Circular Tube ◽  
Copper Wire ◽  
Heat Transfer Surface ◽  
High Porosity ◽  
Transfer Enhancement ◽  
Heat Transfer Characteristics ◽  
Metallic Wire

There are several methods for heat transfer enhancement. For example, there are attaching various fins on the heat transfer surface, processing the surface roughly, inserting twisted tape, and so on. These methods increase heat transfer coefficient or area by manufacturing of the heat transfer surface. However, it has to take into consideration the deterioration of the structure strength by attaching the fins on the tube surface with the design of the heat exchanger. The objective of this study is to clarify characteristics of heat transfer and pressure drop in the channel inserted metallic wire with high porosity. A heat transfer experiment has been performed using a horizontal circular tube to obtain the heat transfer characteristics in the channel inserted copper wire. This paper describes the heat transfer and flow characteristics of a heat exchanger tube filled with a high porous material. Fine copper wire (diameter: 0.5 mm) was inserted in a circular tube dominated by thermal conduction and forced convection. Working fluid was air. Hydraulic equivalent diameter was cited as the characteristic length in Nusselt number and Reynolds number. From the results obtained in this experiment, it was found that an amount of heat transfer in the tube with the copper wire was larger than that without one. An effectiveness of heat transfer enhancement increased with the temperature of the heated wall. The amount of heat transfer in the circular tube inserted copper wire, which has 0.993–0.998 of porosity, increased about 15% comparing with the tube having a smooth wall surface under the condition of the constant heat flux and lower than 170°C of the wall temperature.

1906 Reduction of the Pressure Loss by the Addition of the Organic Nano Tube in the Circular Pipe Flow

2012 ◽  
Vol 2012.18 (0) ◽  
pp. 73-74
Author(s):  
Yuki INAIDA ◽  
Atsushi TAKEYAMA ◽  
Donghyuk KANG ◽  
Kazuhiko YOKOTA
Keyword(s):  
Pipe Flow ◽  
Pressure Loss ◽  
Circular Pipe ◽  
Circular Pipe Flow

S055013 Pressure loss characteristics of the Organic Nano Tube aqueous solution flows in the circular pipe

2011 ◽  
Vol 2011 (0) ◽  
pp. _S055013-1-_S055013-5
Author(s):  
Atsushi TAKEYAMA ◽  
Nobuyoshi HUZIMATU ◽  
Kazuhiko YOKOTA ◽  
Masumi ASAKAWA
Keyword(s):  
Aqueous Solution ◽  
Pressure Loss ◽  
Circular Pipe

Heat Transfer Characteristics of Vertical Rectangular Channel Inserting Copper Wire With High Porosity

2009 ◽  
Author(s):  
Akira Honma ◽  
Tetsuaki Takeda
Keyword(s):  
Heat Transfer ◽  
Porous Material ◽  
Forced Convection ◽  
Cooling System ◽  
Copper Wire ◽  
Rectangular Channel ◽  
High Porosity ◽  
Heat Transfer Characteristics ◽  
The Core ◽  
Transfer Characteristics

In the Very-High-Temperature Reactor (VHTR) which is the next generation nuclear reactor system, ceramics and graphite are used as the fuel coating material and the core structural material, respectively. Even if the accident occurs and the reactor power goes up instantly, the temperature of the core will change slowly. This is because the thermal capacity of the core is so large. Therefore, the VHTR system can passively remove the decay heat of the core by natural convection and radiation from the surface of the reactor pressure vessel (RPV). From the view point of the safety characteristic, the passive cooling system should be designed for the VHTR as the best way of the reactor and vessel cooling systems (VCS). So, the gas cooling system by natural convection is the one of the candidate systems for the VCS of the VHTR. This study is to develop the passive cooling system for the VHTR using the vertical rectangular channel inserting porous materials. In general, when the high temperature circular or rectangular channels are cooled by forced convection of gas, there are several methods for enhancement of heat transfer such as attaching radial or spiral fins on a channel surface or inserting twisted tape in a channel. The objective of this study is to investigate heat transfer characteristics by forced convection of porous materials inserted into a rectangular channel with high porosity. In order to obtain the heat transfer characteristics of the one-side heated vertical rectangular channel inserting the porous material, an experiment was carried out. From the results obtained in this experiment, it was found that an amount of removed heat by forced convection using porous material (porosity > 0.996) was about 15% higher than that without the copper wire. Furthermore, the ratio between the amounts of heat removed of the rectangular channel with the porous material and without the porous material increases with increasing temperature of the channel wall.

Heat Transfer Characteristics of One Side Heated Vertical Rectangular Channel Inserting Porous Material

2012 ◽  
Author(s):  
Tetsuaki Takeda ◽  
Akihiro Sato ◽  
Shumpei Funatani
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Porous Material ◽  
Cooling System ◽  
Copper Wire ◽  
Rectangular Channel ◽  
Vertical Channel ◽  
High Porosity ◽  
The One ◽  
Passive Cooling System

The objective of this study is to not only investigate heat transfer characteristics of natural convection of a one-side heated vertical channel inserting the porous materials with high porosity but also develop the passive cooling system for the Very-High-Temperature Reactor (VHTR). An experiment and analysis was carried out using the one-side heated vertical rectangular channel. From the results obtained in the experiment and analysis, it was found that an amount of removed heat by forced convection using the copper wire (porosity>0.996) was about 15% higher than that without the wire. It was also found that the amount of transferred heat from the heated wall will be increased even if the heat removed by natural convection. Furthermore, the ratio between the amounts of heat removed of the rectangular channel with the porous material and without the porous material increases with increasing temperature of the channel wall. In order to obtain the heat transfer and fluid flow characteristics of the vertical channel inserting porous material, we have also carried out a numerical analysis using a commercial CFD code. This paper describes thermal performances of the one-side heated vertical rectangular channel inserting copper wire with high porosity. From a view point of economical and safety characteristics, the passive cooling system should be designed for the VHTR as the best way of the system. Therefore, the gas cooling system by natural convection is the one of candidate system.

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