scholarly journals A Quantum Heat Exchanger for Nanotechnology

Entropy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 379
Author(s):  
Amjad Aljaloud ◽  
Sally A. Peyman ◽  
Almut Beige
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Time Scales ◽  
Laser Cooling ◽  
Trapped Ions ◽  
Cooling Rates ◽  
Atomic Gas ◽  
Optical Time ◽  
Quantum Technology ◽  
Quantum Optical

In this paper, we design a quantum heat exchanger which converts heat into light on relatively short quantum optical time scales. Our scheme takes advantage of heat transfer as well as collective cavity-mediated laser cooling of an atomic gas inside a cavitating bubble. Laser cooling routinely transfers individually trapped ions to nano-Kelvin temperatures for applications in quantum technology. The quantum heat exchanger which we propose here might be able to provide cooling rates of the order of Kelvin temperatures per millisecond and is expected to find applications in micro- and nanotechnology.

Experimental Study on Flow and Heat Transfer Characteristics in a Microscale Heat Exchanger

2007 ◽  
Author(s):  
Tao Wang ◽  
Xuegong Hu ◽  
Dawei Tang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Exchanger ◽  
Thermal Resistance ◽  
Flow Rate ◽  
Laser Cooling ◽  
Cooling System ◽  
Volumetric Flow Rate ◽  
Distilled Water ◽  
Total Thermal Resistance

To solve the questions of the middle heat exchanger of space-based laser cooling system such as large heat transfer area and operating mode instability, a MC-MG (Microchannel-Microgroove) microscale heat exchanger is proposed and experimental study is carried out. The experimental results indicate that as the Reynolds number increases, the Nusselt number originally increases and then keeps constant. While adding the volumetric flow rate of distilled water in the microchannels, the total thermal resistance is first reduced and then becomes steady. With increasing the volumetric flow rate of distilled water, the total quantity of heat transfer increases first, then decreases and finally tends to be constant. The average heat transfer coefficient of the heat exchanger reaches to 1.6 × 104W/ (m2-K) and total thermal resistance is less than 0.21K/W. Therefore the solution to cooling laser with the heat exchanger is preferable.

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