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We present a four-band and polarization-insensitive terahertz metamaterial absorber formed by four square metallic rings and a metallic ground plane separated by a dielectric layer. It is found that the structure has four distinctive absorption bands whose peaks are over 97% on average. The mechanism of the four-band absorber is attributed to the overlapping of four resonance frequencies, and the...
The objective of this work is to examine the detailed heat transfer characteristics on either smooth or rib-roughened surfaces under arrays of impinging elliptic jets by using a liquid crystal thermograph technique. The impingement heat transfer performance for elliptic jet holes of five different aspect ratios, AR, and three jet-to-target spacing, Z = 1.5, 3 and 4.5 were tested at jet Reynolds numbers,...
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