Cooler for heat conditioning of glass in the cooling channel of a tank furnace

Silicone rubber mold (SRM) is capable of reducing the cost and time in a new product development phase and has many applications for the pilot runs. Unfortunately, the SRM after injection molding has a poor cooling efficiency due to its low thermal conductivity. To improve the cooling efficiency, the thermal conductivity of the SRM was improved by adding fillers into the SRM. An optimal recipe for fabricating a high cooling efficiency low-pressure injection mold with conformal cooling channel fabricated by fused deposition modeling technology was proposed and implemented. This study proposes a recipe combining 52.6 wt.% aluminum powder, 5.3 wt.% graphite powder, and 42.1 wt.% liquid silicon rubber can be used to make SRM with excellent cooling efficiency. The price–performance ratio of this SRM made by the proposed recipe is around 55. The thermal conductivity of the SRM made by the proposed recipe can be increased by up to 77.6% compared with convention SRM. In addition, the actual cooling time of the injection molded product can be shortened up to 69.1% compared with the conventional SRM. The actual cooling time obtained by the experiment is in good agreement with the simulation results with the relative error rate about 20%.

Inhomogeneous behavior of supercritical hydrocarbon fuel flow in a regenerative cooling channel for a scramjet engine

Aerospace Science and Technology ◽

10.1016/j.ast.2021.106901 ◽

2021 ◽

pp. 106901

Author(s):

Feng Sun ◽

Xin Li ◽

Sandra K.S. Boetcher ◽

Gongnan Xie

Keyword(s):

Hydrocarbon Fuel ◽

Cooling Channel ◽

Regenerative Cooling ◽

Fuel Flow ◽

Scramjet Engine

A Numerical and Experimental Investigation of the Thermal Behavior of a Permanent Metal Mold with a Conventional Cooling Channel and a New Cooling Channel Design

International Journal of Metalcasting ◽

10.1007/s40962-021-00633-4 ◽

2021 ◽

Author(s):

Mehmet Kan ◽

Osman Ipek

Keyword(s):

Experimental Investigation ◽

Thermal Behavior ◽

Cooling Channel ◽

Metal Mold ◽

Channel Design ◽

Conventional Cooling

Heat Transfer in a Cooling Channel with Vortex Generators

Journal of Heat Transfer ◽

10.1115/1.2824205 ◽

1997 ◽

Vol 119 (2) ◽

pp. 206-206 ◽

Cited By ~ 4

Author(s):

Mingking K. Chyu ◽

Hui Ding

Keyword(s):

Heat Transfer ◽

Vortex Generators ◽

Cooling Channel

Optimization Design of Lattice Structures in Internal Cooling Channel with Variable Aspect Ratio of Gas Turbine Blade

Energies ◽

10.3390/en14133954 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3954

Author(s):

Liang Xu ◽

Qicheng Ruan ◽

Qingyun Shen ◽

Lei Xi ◽

Jianmin Gao ◽

...

Keyword(s):

Heat Transfer ◽

Aspect Ratio ◽

Optimization Model ◽

Lattice Structure ◽

Turbine Blades ◽

Internal Cooling ◽

Cooling Channel ◽

Cooling Channels ◽

Mechanical Performances ◽

Type Lattice

Traditional cooling structures in gas turbines greatly improve the high temperature resistance of turbine blades; however, few cooling structures concern both heat transfer and mechanical performances. A lattice structure (LS) can solve this issue because of its advantages of being lightweight and having high porosity and strength. Although the topology of LS is complex, it can be manufactured with metal 3D printing technology in the future. In this study, an integral optimization model concerning both heat transfer and mechanical performances was presented to design the LS cooling channel with a variable aspect ratio in gas turbine blades. Firstly, some internal cooling channels with the thin walls were built up and a simple raw of five LS cores was taken as an insert or a turbulator in these cooling channels. Secondly, relations between geometric variables (height (H), diameter (D) and inclination angle(ω)) and objectives/functions of this research, including the first-order natural frequency (freq1), equivalent elastic modulus (E), relative density (ρ¯) and Nusselt number (Nu), were established for a pyramid-type lattice structure (PLS) and Kagome-type lattice structure (KLS). Finally, the ISIGHT platform was introduced to construct the frame of the integral optimization model. Two selected optimization problems (Op-I and Op-II) were solved based on the third-order response model with an accuracy of more than 0.97, and optimization results were analyzed. The results showed that the change of Nu and freq1 had the highest overall sensitivity Op-I and Op-II, respectively, and the change of D and H had the highest single sensitivity for Nu and freq1, respectively. Compared to the initial LS, the LS of Op-I increased Nu and E by 24.1% and 29.8%, respectively, and decreased ρ¯ by 71%; the LS of Op-II increased Nu and E by 30.8% and 45.2%, respectively, and slightly increased ρ¯; the LS of both Op-I and Op-II decreased freq1 by 27.9% and 19.3%, respectively. These results suggested that the heat transfer, load bearing and lightweight performances of the LS were greatly improved by the optimization model (except for the lightweight performance for the optimal LS of Op-II, which became slightly worse), while it failed to improve vibration performance of the optimal LS.

Fabrication of circular cooling channels by cold metal transfer based wire and arc additive manufacturing

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1177/0954405421995613 ◽

2021 ◽

pp. 095440542199561

Author(s):

Shaohua Han ◽

Zhongzhong Zhang ◽

Pengxiang Ruan ◽

Shiwen Cheng ◽

Dingqi Xue

Keyword(s):

Additive Manufacturing ◽

High Energy ◽

Cooling Effect ◽

High Deposition Rate ◽

Cooling Channel ◽

Conformal Cooling Channel ◽

Conformal Cooling ◽

Energy Beam ◽

Cooling Channels ◽

Straight Line

Additive manufacturing has been proven to be a promising technology for fabricating high-performance dies, molds, and conformal cooling channels. As one of the manufacturing methods, wire and arc additive manufacturing displays unique advantages of low cost and high deposition rate that are better than other high energy beam-based ones. This paper presents a preliminary study of fabricating integrated cooling channels by CMT-based wire and arc additive manufacturing process. The deposition strategies for fabricating circular cross-sectional cooling channels both in conformal and straight-line patterns have been investigated. It included optimizing the welding torch angle, fabricating the enclosed semicircle structure and predicting the collision between the torch and constructed part. The cooling effect test was also conducted on both the conformal cooling channel and straight-line cooling channel. The results affirmed a higher cooling efficiency and better uniform cooling effect of the conformal cooling channel than straight-line cooling channel.

Internal face finishing for a cooling channel using a fluid containing free abrasive grains

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-021-06893-y ◽

2021 ◽

Author(s):

Mitsugu Yamaguchi ◽

Tatsuaki Furumoto ◽

Shuuji Inagaki ◽

Masao Tsuji ◽

Yoshiki Ochiai ◽

...

Keyword(s):

High Speed ◽

Flow Behavior ◽

Flow Simulation ◽

Cooling Channel ◽

H13 Steel ◽

Channel Diameter ◽

Abrasive Grains ◽

Low Viscosity ◽

Short Period ◽

Internal Pressures

AbstractIn die-casting and injection molding, a conformal cooling channel is applied inside the dies and molds to reduce the cycle time. When the internal face of the channel is rough, both cooling performance and tool life are negatively affected. Many methods for finishing the internal face of such channels have been proposed. However, the effects of the channel diameter on the flow of a low-viscosity finishing media and its finishing characteristics for H13 steel have not yet been reported in the literature. This study addresses these deficiencies through the following: the fluid flow in a channel was computationally simulated; the flow behavior of abrasive grains was observed using a high-speed camera; and the internal face of the channel was finished using the flow of a fluid containing abrasive grains. The flow velocity of the fluid with the abrasive grains increases as the channel diameter decreases, and the velocity gradient is low throughout the channel. This enables reduction in the surface roughness for a short period and ensures uniform finishing in the central region of the channel; however, over polishing occurs owing to the centrifugal force generated in the entrance region, which causes the form accuracy of the channel to partially deteriorate. The outcomes of this study demonstrate that the observational finding for the finishing process is consistent with the flow simulation results. The flow simulation can be instrumental in designing channel diameters and internal pressures to ensure efficient and uniform finishing for such channels.