scholarly journals Thermo-Optic Numerical Research on Segmented Circular LD Arrays Side-Pumping a Nd:YAG Laser Rod

2020 ◽  
Vol 10 (20) ◽  
pp. 7316
Author(s):  
Wei Wang ◽  
Qin Zhao ◽  
Wenqing Gao ◽  
Zhenyue Hu ◽  
Qihang Zhao ◽  
...  
Keyword(s):  
Cooling System ◽  
Beam Quality ◽  
Heat Removal ◽  
Liquid Cooling ◽  
Temperature Distributions ◽  
Side Pumping ◽  
Laser Systems ◽  
Numerical Research ◽  
Liquid Cooling System ◽  
Complex Liquid

The configuration designs of the laser diode (LD) side-pumping laser rods focus on how to solve the space conflict between the pump and heat-removal devices because both want to use the larger lateral surface of the laser rod. The conflict is better balanced in the three different side-pumping geometries: the segmented circular LD array side-pumping configuration, the annular liquid-cooling structure, and the compensated semicircular LD array side-pumping arrangement. The temperature distributions and thermo-optic effects of the laser rod in the segmented circular LD array side-pumping configuration are analyzed in contrast with those in the other arrangements. The numerical results indicate that the periodical segment-pumping scheme provides higher beam quality than the compensated semicircular side-pumping scheme, enabling removal of the complex liquid cooling system in medium-power applications, thus showing the potential to be used in compact and miniature laser systems.

Self-Contained, Oscillating Flow Liquid Cooling System for Thin Form Factor High Performance Electronics

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
R. Wälchli ◽  
T. Brunschwiler ◽  
B. Michel ◽  
D. Poulikakos
Keyword(s):  
Heat Transfer ◽  
Form Factor ◽  
Waste Heat ◽  
Cooling System ◽  
Heat Removal ◽  
Flow Loop ◽  
Liquid Cooling ◽  
High Heat Transfer ◽  
Cold Plates ◽  
Liquid Cooling System

A self-contained, small-volume liquid cooling system for thin form-factor electronic equipment (e.g., blade server modules) is demonstrated experimentally in this paper. A reciprocating water flow loop absorbs heat using mesh-type microchannel cold plates and spreads it periodically to a larger area. From there, the thermal energy is interchanged via large area, low pressure drop cold plates with a secondary heat transfer loop (air or liquid). Four phase-shifted piston pumps create either a linearly or radially oscillating fluid flow in the frequency range of 0.5–3 Hz. The tidal displacement of the pumps covers 42–120% of the fluid volume, and, therefore, an average flow rate range of 100–800 ml/min is tested. Three different absorber mesh designs are tested. Thermal and fluidic characteristics are presented in a time-resolved and a time-averaged manner. For a fluid pump power of 1 W, a waste heat flux of 180 W/cm2(ΔT=67 K) could be dissipated from a 3.5 cm2 chip. A linear oscillation flow pattern is advantageous over a radial one because of the more efficient heat removal from the chip and lower hydraulic losses. The optimum microchannel mesh density is determined as a combination of low pump losses and high heat transfer rates.

Multi-objective optimization of a chip-attached micro pin fin liquid cooling system

2021 ◽  
pp. 117187
Author(s):  
Vahideh Radmard ◽  
Yaser Hadad ◽  
Srikanth Rangarajan ◽  
Cong H. Hoang ◽  
Najmeh Fallahtafti ◽  
...  
Keyword(s):  
Cooling System ◽  
Multi Objective Optimization ◽  
Liquid Cooling ◽  
Multi Objective ◽  
Pin Fin ◽  
Liquid Cooling System

Study on Copper Cold Plate Designs for Electronics Liquid Cooling System

2006 ◽  
Author(s):  
Yi. Feng ◽  
Y. Wang ◽  
C. Y. Huang
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Cooling System ◽  
Pure Copper ◽  
Cold Plate ◽  
Performance Limits ◽  
Liquid Cooling ◽  
Cold Plates ◽  
Management Approaches ◽  
Liquid Cooling System

The increasing power consumption of microelectronic systems and the dense layout of semiconductor components leave very limited design spaces with tight constraints for the thermal solution. Conventional thermal management approaches, such as extrusion, fold-fin, and heat pipe heat sinks, are somehow reaching their performance limits, due to the geometry constraints. Currently, more studies have been carried out on the liquid cooling technologies, as the flexible tubing connection of liquid cooling system makes both the accommodation in constrained design space and the simultaneous cooling of multi heating sources feasible. To significantly improve the thermal performance of a liquid cooling system, heat exchangers with more liquid-side heat transfer area with acceptable flow pressure drop are expected. This paper focuses on the performance of seven designs of source heat exchanger (cold plate). The presented cold plates are all made in pure copper material using wire cutting, soldering, brazing, or sintering process. Enhanced heat transfer surfaces such as micro channel and cooper mesh are investigated. Detailed experiments have been conducted to understand the performance of these seven cooper cold plates. The same radiators, fan, and water pump were connected with each cooper cold plate to investigate the overall thermal performance of liquid cooling system. Water temperature readings at the inlets and outlets of radiators, pump, and colder plate have been taken to interpret the thermal resistance distribution along the cooling loop.

scholarly journals Design of a prototype of an engine mechanism with rotating cylinders

2020 ◽  
Vol 318 ◽  
pp. 01004
Author(s):  
Miroslav Blatnický ◽  
Ján Dižo
Keyword(s):  
High Speed ◽  
Cooling System ◽  
Ambient Air ◽  
Combustion Engines ◽  
Connecting Rod ◽  
Rotating Cylinders ◽  
Liquid Cooling ◽  
Working Cycle ◽  
Liquid Cooling System ◽  
Crank Mechanism

In this article, authors focus on the design and construction of a real prototype of an engine mechanism with rotating cylinders and its using mainly in piston combustion engines. It is assumed, that the normal force of a piston will be completely eliminated, because the swing angle of a connecting rod will equal to zero during the whole working cycle, since the connecting arm of the piston moves just the cylinder axis. It will by allowed by the conceptual design of the mechanism presented in this article. As rotating blocks of cylinders concurrently act as a flywheel, it is proposed, that in this way there is possible to save the mass of additional flywheels. Moreover, liquid cooling system is not necessary, because the rotating cylinders sufficiently transfer heat to ambient air. In addition, the output of torque will be reached without necessity of gear transmission, which results to decreasing of needs of mechanism lubrication. Other advance of the designed mechanism are two outputs. The first output is low-speed and it goes out from rotating cylinders, i. e. from the slider-crank mechanism with revolutions n1. The other output is high-speed, from the crankshaft with revolutions n2. Because of more favourable properties of the mechanism, authors have decided to create a real device to confirm all mentioned advantages of the mechanism by the suitable way.

scholarly journals The study of gas-liquid flow dynamics in the inclined-corrugated elements of cooling tower filler unit

2019 ◽  
Vol 126 ◽  
pp. 00031 ◽  
Author(s):  
lnur N. Madyshev ◽  
Aliya I. Khafizova ◽  
Oksana S. Dmitrieva
Keyword(s):  
Liquid Flow ◽  
Cooling Tower ◽  
Cooling System ◽  
Flow Dynamics ◽  
Stable Operation ◽  
Liquid Cooling ◽  
Two Phase ◽  
Liquid Drops ◽  
Gas Liquid Flow ◽  
Liquid Cooling System

This paper deals with the studies of cooling tower, operated with the contactless evaporative cooling technology. The authors developed the cooling tower with a three-flow liquid cooling system. The authors conducted the numerical studies of gas-liquid flow dynamics in the inclined-corrugated elements of checker filling unit that allows to give us an idea of two-phase flow structure, its movement throughout the checker filling, as well as to assess the influence of mode parameters on the efficiency of collecting the liquid drops and the range of stable operation of device. The most effective operation of this device is at the pressure drop of 100 Pa, while developing the average air flow rate in the element up to 3.2 m/s.

scholarly journals Creation of two-level liquid cooling system of PC

2017 ◽  
Vol 110 ◽  
pp. 01044
Author(s):  
Sergey V. Koynov ◽  
Egor A. Tarasov
Keyword(s):  
Cooling System ◽  
Liquid Cooling ◽  
Liquid Cooling System

scholarly journals Investigation of a Direct Liquid Cooling System in a Permanent Magnet Synchronous Machine

2020 ◽  
Vol 35 (2) ◽  
pp. 808-817 ◽  
Author(s):  
Ilya Petrov ◽  
Pia Lindh ◽  
Markku Niemela ◽  
Eero Scherman ◽  
Oskar Wallmark ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Cooling System ◽  
Synchronous Machine ◽  
Permanent Magnet Synchronous Machine ◽  
Liquid Cooling ◽  
Liquid Cooling System
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