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Recently, optical fiber bragg grating (OFBG) sensors with different functions have been developed and applied in Structure Health Monitoring. This letter introduces a noval acceleration transducer with a characteristic of temperature self-compensating. It is a cantilever structure model with an equal strength beam; two OFBGs are bonded on both the upper and lower surface of the beam. According to...
In this paper the feasibility study of an optical fiber Bragg grating (FBG) based chemical sensor is presented. A previously developed FBG pressure sensor was modified by enveloping the grating regions with polymer sleeves. When in contact with different chemical solvents, the polymers react with different degrees of swelling which change the force exerted on the underlying FBG, modulating the grating...
Pressure drop and heat transfer characteristics of different dimple vortex generators arrangement are examined in this study. A total of five heat sinks were made and tested, including plain fin, dimple, two-group dimple, oblique dimple gap 4-12 fin, oblique dimple gap 6-12 fin. The tested results indicate that the pressure drop for dimple fin geometry is significantly higher than other fin types,...
This study performs an experimental study concerning performance of an LED array under natural convection. A total of 270 1-W LEDs having an efficiency of 75% are used to simulate a large LED panel. The size of the cooling heat sink is 348 mm × 558 mm having vertical plate fin configuration with a fin spacing of 9.33 mm. The effect of shrouding, including shrouding above the heat sink and the blockages...
The present study investigates the heat transfer and pressure drop characteristics of the dielectric fluid HFE-7100 within multiport microrchannel heat sink with square microchannels having a hydraulic diameter of 790 ??m subject to a tilted arrangement of 45 degree. For a mass flux of 100 or 200 kg/m2??s, it is found that the heat transfer coefficients are for the tilted arrangement is roughly the...
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