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A. Mallikarjuna Reddy,Chang Woo Byun,주승기,A. Sivasankar Reddy,P. Sreedhara Reddy 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.5
The influence of substrate temperature on the properties NiO films, prepared by dc reactive magnetron sputtering technique, is studied by various characterization methods. X-ray diffraction studies revealed that the crystal structure is highly influenced by the substrate temperature. The optical results indicated that the optical transmittance and band gap of the films increased with the increase of substrate temperature up to 523 K. The optical band gap of NiO films decreases from 3.82 to 3.70 eV with the increase of substrate temperature from 523 to 723 K. The electrical resistivity decreased with the increase of substrate temperature from 303 to 723 K, whereas carrier concentration and Hall mobility increased with increasing the substrate temperature.
EXPERIMENTAL INVESTIGATION ON TEMPERATURE SEPARATION OF DUAL FORCED FLOW VORTEX TUBE
G. MARUTHI PRASAD YADAV,P. MALLIKARJUNA REDDY,B. UMA MAHESWAR GOWD 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.4
The vortex tube is a device, which emanates hot and cold air streams simultaneously at its two ends from a source of pressurized air: warmer, gas leaves near the periphery at one end as a free vortex and colder, gas leaves via an orifice at the opposite end as a forced vortex. The forced vortex strikes back again by design modifications, result in the formation of one more forced vortex flow. Thus, the modified vortex tube is named as dual forced flow vortex tube (DFFVT). Experimental study is carried on temperature separation of DFFVT for varying pressures, mass flow rates and optimum cold fractions at two ends for efficient temperature drop is revealed. The modified vortex tube yields effectual temperature drop through one end at a lower cold fraction meanwhile providing effective cooling at the other end with higher cold fraction and vice versa.