scholarly journals Design and Thermal Analysis of Temperature Control Experiment Box for Final Optic Assembly

2021 ◽  
Vol 2083 (2) ◽  
pp. 022052
Author(s):  
Changqi Chen ◽  
Tianshu Xi ◽  
Yanan Zhang
Keyword(s):  
Thermal Analysis ◽  
Temperature Control ◽  
Frequency Conversion ◽  
Control Experiment ◽  
Radiation Heat Transfer ◽  
Frequency Doubling ◽  
Laser Frequency ◽  
Inertial Confinement ◽  
Control Research ◽  
Set Up

Abstract The Final Optic Assembly (FOA) is one of the key components of the inertial confinement nuclear fusion device. The temperature change in the FOA is related to the laser frequency conversion efficiency of the frequency doubling crystal. In order to research the temperature control of FOA, this paper considers the internal atmosphere and internal structure of FOA, designed and fabricated a vacuum temperature control experiment box, and set up heat sources inside the box to simulate the internal heating of the FOA. This article uses different radiation heat transfer models to analysis the temperature field of the vacuum experiment box. Compare the thermal simulation results of the S2S model and the DO model, and compare them with the actual temperature of the vacuum experiment box under the same boundary conditions. The results show that the S2S model fits well with the experimental results and is more suitable for thermal analysis of FOA, which is of great significance to the follow-up FOA temperature control research.

Experimental and numerical investigations on a high-density polyethylene (HDPE) blown film cooling with a new design of the counter-flow/radial jet air-ring

2021 ◽  
pp. 875608792110260
Author(s):  
ME Ismail ◽  
MM Awad ◽  
AM Hamed ◽  
MY Abdelaal ◽  
EB Zeidan
Keyword(s):  
Heat Transfer ◽  
Numerical Simulations ◽  
Film Cooling ◽  
Radiation Heat Transfer ◽  
Absolute Error ◽  
Numerical Results ◽  
Upper Lip ◽  
Original Design ◽  
Blown Film ◽  
Set Up

This study experimentally and numerically investigates a typical HDPE blown film production process cooled via a single-lip air-ring. The processing observations are considered for the proposed subsequent modifications on the air-ring design and the location relative to the die to generate a radial jet, directly impinging on the bubble. Measurements are performed to collect the actual operating parameters to set up the numerical simulations. The radiation heat transfer and the polymer phase change are considered in the numerical simulations. The velocity profile at the air-ring upper-lip is measured via a five-hole Pitot tube to compare with the numerical results. The comparison between the measurements and the numerical results showed that the simulations with the STD [Formula: see text] turbulence model are more accurate with a minimum relative absolute error (RAE) of 1.6%. The numerical results indicate that the peak Heat Transfer Coefficient (HTC) at the impingement point for the modified design with radial jet and longer upper-lip is 29.1% higher than the original design at the same conditions. Besides, increasing the air-ring upper-lip height increased the averaged HTC, which is 13.4% higher than the original design.

Design of a Thermostat for Precise Temperature Control From −190 Deg to +650 Deg C

1969 ◽  
Vol 91 (2) ◽  
pp. 168-172
Author(s):  
J. Ansari ◽  
W. Leidenfrost ◽  
R. Oldenburger
Keyword(s):  
Heat Transfer ◽  
Differential Equations ◽  
Temperature Control ◽  
Hypothetical Case ◽  
Heat Transfer Medium ◽  
System Parameters ◽  
Set Up ◽  
Proportional Controller ◽  
Cylindrical Block ◽  
Selection Of

A proposed apparatus for controlling temperatures from −190 deg to +650 deg with an estimated accuracy of 0.001 deg C is described. The apparatus utilizes helium as the heat transfer medium. The selection of the gain constants of the controller depends upon the system parameters. The hypothetical case of a solid cylindrical block with an integral plus proportional controller is considered, the differential equations are set up, and a graphical scheme is presented for the selection of the controller constants.

Thermal Effect Analysis of 1560 nm Laser Frequency Doubling in a PPLN Crystal

2015 ◽  
Vol 42 (7) ◽  
pp. 0708002
Author(s):  
张远涛 Zhang Yuantao ◽  
屈求智 Qu Qiuzhi ◽  
钱军 Qian Jun ◽  
任伟 Ren Wei ◽  
项静峰 Xiang Jingfeng ◽  
...  
Keyword(s):  
Thermal Effect ◽  
Frequency Doubling ◽  
Laser Frequency ◽  
Effect Analysis ◽  
Ppln Crystal

Designed of Wireless Intellectualized Temperature Control System in Tobacco Preserve Based on Fuzzy-PID

2013 ◽  
Vol 416-417 ◽  
pp. 890-894
Author(s):  
Xiao Hui Guo
Keyword(s):  
Temperature Control ◽  
Control Method ◽  
Control Function ◽  
Temperature Control System ◽  
Pid Controllers ◽  
Fuzzy Pid ◽  
Single Chip ◽  
Control Effect ◽  
Set Up ◽  
The Individual

Tobacco Warehousing is chiefly applied to preserve the tobacco that is separated into leaf and stem so that the tobacco moisture is controlled at the range of technology demand.The present control method of tobacco save is that the references of every PID control link are set up and adjusted by human experience. So, the control effect varies with the individual and the output tobacco moisture can't maintain stable.The fuzzy-PID temperature system is based on CC2430 single chip. It includes the power source, the manipulative algorithm, the temperature examination , the correspondence of up PC and the output-control of the switch value and so on. Computer takes the parameter deviation and the deviation change as input, and the PID controllers parameters of ΔKp, Δki, ΔKd as output. The sub program realized the corresponding events by completing zone bit and zone bit judgment. The main program realized temperature control function by calling the wireless micro-controller sends a signal to the charged unit

Food research under the Department of Scientific and Industrial Research

1951 ◽  
Vol 138 (890) ◽  
pp. 31-47
Keyword(s):  
Royal Society ◽  
Industrial Research ◽  
Advisory Council ◽  
Food Research ◽  
National Importance ◽  
High Commissioner ◽  
Control Research ◽  
Set Up ◽  
And Control ◽  
Research Director

The Department of Scientific and Industrial Research (D. S. I. R.) was established in 1916 and, in June 1917, the Cold Storage and Ice Association sent a deputation to the Department’s Advisory Council, stating that thousands of tons of food were lost annually by decay before they could be marketed, and urging the national importance of research by Government on the preservation of foodstuffs. The Council agreed to consider the matter, and in October a report was prepared and presented by the late Sir William Hardy (then Mr W. B. Hardy, Secretary of the Royal Society and Secretary of the Society’s Food (War) Committee), and three other Fellows of the Society, the late Professors W. M. Bayliss, J. B. Farmer and Gowland Hopkins. A Research Director and a Research Board were recommended and appointed, the terms of reference of the Board being ‘To organize and control research into the preparation and preservation of foods’. The decision thus taken implied that the work to be done was considered to belong broadly to the class of national researches better conducted by the State than by industry with Government assistance. Hardy was the first Director and the members of the Board were Sir Kenneth Anderson, Sir Walter Fletcher, Sir Richard Threlfall, Professor T. B. Wood, Sir Thomas MacKenzie (High Commissioner for New Zealand) and Sir Joseph Broodbank (Chairman of the Port of London Authority). The Board became known as the Food Investigation Board—or the ‘F. I. B.’. The word ‘investigation’ rather than ‘research’ was used to avoid confusion with the Fuel Research Board—F. R. B.—which had been set up in the previous year. £5000 was allocated for the expenses of the first half-year, and the Board presented its first report in November 1918.

Intracavity and resonant external cavity laser frequency doubling using semiconductor heterostructures

1993 ◽  
Author(s):  
Siegfried Janz ◽  
Hongxing Dai ◽  
F. Chatenoud ◽  
Michael M. Dion ◽  
Richard J. F. Normandin
Keyword(s):  
External Cavity ◽  
Frequency Doubling ◽  
Laser Frequency ◽  
Semiconductor Heterostructures ◽  
External Cavity Laser ◽  
Cavity Laser

Precise Set-Point Control of Temperature for Coral Bleaching Experiments

2002 ◽  
Vol 36 (1) ◽  
pp. 70-75 ◽  
Author(s):  
Phil Turner ◽  
Ray Berkelmans ◽  
Matt Brodie
Keyword(s):  
Temperature Control ◽  
Control Technology ◽  
Experimental Conditions ◽  
Set Point ◽  
Testing Environment ◽  
Precise Control ◽  
Precision Temperature ◽  
Control Technologies ◽  
Set Up ◽  
Better Than

Experimental research into the upper thermal limits of corals is underpinned by the need for precise control of water temperature in the testing environment, with evidence that temperature differences of as little as 0.1°C can be a significant factor in whether coral bleaches or not. Off-the-shelf temperature control equipment is generally unsuitable for high precision temperature experiment because the realized accuracy of temperature control is typically less than 0.5°C, even from state-of-the-art proportional, integral, derivative (PID) control technology. However, high temperature resolution and accuracy is achievable using simple control technology. This paper reviews the principles behind two temperature control technologies and describes a system capable of controlling temperature in actual experimental conditions to better than ±0.05°C over a 24-hr period and typically better than ±0.1°C over a 12-day period. This result is obtained through appropriate design of the experimental tank set-up and the use of “on-off” temperature control technology with very small hysteresis. Accuracy of set-point temperature is maintained by calibration against a reference temperature. Sensor drift, resulting from ambient temperature fluctuations, is avoided by immersing the circuitry in the temperature-controlled water.

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