Micro Coolers

Micro coolers Micro energy harvesting Micro energy scavenging Micro fuel cells Micro heat engines Micro power generation Microengines Micropropulsion Power MEMS... 

Heppner, J.D., Walther, D.C. and Pisano, A.P. (2007). The design of ARCTIC a rotary compressor thermally insulated micro-cooler. Sensors and Actuators A, Vol. 134, pp. 47-56. 

Calame JP, Myers RE, Binari SC, Wood FN, Garven M (2007) Experimental investigation of micro-channel coolers for the high heat flux thermal management of GaN-on-SiC semiconductor devices. Int J Heat Mass Transfer 50 4767-4779 Celata GP, Cumo M, Zummo G (2004) Thermal-hydraulic characteristics of single- phase flow in capillary pipes. Exp Thermal Fluid Sci 28 87-95 Celata GP (2004). Heat transfer and fluid flow in micro-channels. Begell House, N.Y. 

Chung PM-Y, Kawaji M (2004) The effect of channel diameter on adiabatic two-phase flow characteristics in micro-channels. Int J Multiphase Flow 30 735-761 Colgan E (2005) A practical implementation of silicon microchannel coolers for high power chips. 

Fig. 9.9 Experimental set-up 1 test module, 2 heater, 3 electrical contact, 4 micro-channel, 5 Pyrex, 6 peristaltic pump, 7 and 8 pressure and temperature measurements, 9 cooler, 10 reservoir, 77 IR camera, 72 microscope, 13 high-speed video camera, 14 PC, 75 synchronizer, 16 video recorder. Reprinted from Peles et al. (2001) with permission...

A complete reactor module was built, consisting of the actual micro reactor and an encasement that serves for temperature setting [28], The latter consists of two parts, a furnace for setting the high temperature in the reactor inlet collection zone and in the reaction zone and a cooler for the outlet collection zone. The micro reactor has a housing with standard tube connections. An electric furnace serves for heating, Temperatures can be measured in the furnace, at the furnace/micro reactor border and in the outlet collection zone. For thermal insulation, a 2 mm ceramic... 

Figure 4.33 Electrochemical micro reactor with integrated electrode cooler. Left overall view. Right schematic of dismantled reactor [69].

As soon as micro-bubbles only are being produced in the nitrometer close the stop-cock on the connecting tube, detach the rubber connecting tube from the combustion tube, close the latter with a cap made from rubber tubing, and leave to cool whilst maintaining the internal carbon dioxide pressure. Remove the nitrometer to a somewhat cooler room (room in which the barometer is kept preferably) after raising the bulb so that the surfaces of the two columns of liquid are at the same level. 

Figure4.104 Micro structured liquid coolers in a workstation [161] (by courtesy of ATOTECH).

Figure 5. Micro - loop heat pipe - the electronic microchip cooler, [21].

Sorption heat pipe can be used as an efficient multi micro jet cooler of the laser diode with good thermal contact of the SPH porous wick and heat loaded wall, insensitive to some g acceleration and capable to dissipate high heat fluxes q > 200 W/cm for ammonia with low surface superheat. 

The fundamental operating principles of micro-heat pipes are essentially the same as those occurring in larger, more conventional heat pipes. Heat applied to one end of the heat pipe vaporizes the liquid in that region and forces it to move to the cooler end, where it condenses and gives up the latent heat of vaporization. This vaporization and condensation process causes the liquid-vapor interface in the liquid arteries to change continually along the pipe,... 

Figure 7. Apparatus for micro-distillation a) Sample vessel b)Frit c)Healer d)Capillary e) Absorption vessel f) Cooler g) Keyboard and display h) Protection hood i) Syringe for reagent feeding j) Septum (with permission from Dr. Tim Mansfeldt. Ruhr-Univer.sitat Bochum. Germany)...

Tubular units with micro-mbes having internal diameters of 3 to 80 microns have been studied, both for single and two phase flows. A slightly larger variant for use for cryo-coolers is shown in Figure 4.17. (See Longsworth (1999), for a useful discussion of Joule-Thomson cryo-coolers based on such finned tube geometries.)... 

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