Browsing by Author "HUANG, CS"

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EXPERIMENTAL-STUDY OF THE HEAT-TRANSFER ENHANCEMENT OF AN OUTER TUBE WITH AN INNER-TUBE INSERTION
(1995-12-01)
FU, WS
;
TSENG, CC
;
HUANG, CS
;
交大名義發表
;
機械工程學系
This experimental study aims to investigate the heat transfer phenomena of an outer tube with an inner-tube insertion. The naphthalene sublimation method is adopted which measures the sublimation depth of naphthalene necessary to reduce the local heat transfer through the analogue relation between heat and mass transfer. The working fluid is air and the data runs are performed for Reynolds numbers of 1058, 1360 and 1965. The comparison between experimental and numerical results shows good agreement. It is also found that, with an inner-tube insertion, the heat transfer rate of the outer tube increases as the Reynolds number of the tube flow and the size of inner tube increase, as long as the inner tube is not Larger than a given size.
GROWTH-BEHAVIOR OF Y1BA2CU3O7-X SUPERCONDUCTING THIN-FILMS USING LASER-ABLATION TECHNIQUE
(1994-07-01)
HUANG, CS
;
LIN, IN
;
LEE, JYM
;
TSENG, TY
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電子工程學系及電子研究所
The growth behavior of Y1Ba2Cu3O7-x (YBCO) thin films on MgO substrates synthesized by laser ablation deposition techniques has been investigated. The effects of important parameters, i.e., substrate temperature, post annealing schemes, laser beam fluence and deposition chamber atmosphere on the crystal structure, microstructure and superconductivity of the deposited films have been studied. Among those important depositing parameters, the plume to film interaction was observed to impose the most prominent effect on the film characteristics. The films were found to consist mainly of a noncrystalline phase whenever the substrates were located either in the invisible or the supersonic zones of the plume. Only when the substrates are positioned in the reactive zone does the crystalline phase grow rapidly via a nucleation and growth mechanism. The (013) grains nucleate preferentially and are subsequently transformed into a (00m) orientation, possibly by diffusion. The number of (013) grains transformed increases with temperature used for step annealing and with time at that temperature.
SYNTHESES AND CHARACTERIZATIONS OF ALLYL CELLULOSE AND GLYCIDYL CELLULOSE
(1992-10-01)
LIN, MS
;
HUANG, CS
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
Allyl cellulose was synthesized by reacting cellulose with allyl bromide in homogeneous LiCl/DMAc solution containing NaOH powder. The degree of substitution (DS) per anhydroglucose (AHG) unit was determined by titrating the allyl cellulose with bromine in chloroform solution, and an allyl DS of 2.80 was found. Glycidyl cellulose was then prepared by reacting this allyl cellulose with peracetic acid in methylene chloride at ambient temperature for 6 days. The measured reaction rate constant was 1.33 X 10(-3) min-1. The glycidyl cellulose thus obtained with a glycidyl DS of 2.58 was determined by titrating the product with perchloric acid in conjunction with tetrabutylammonium iodide. The 2.58 of glycidyl DS was also confirmed by H-1-NMR integration. Both allyl cellulose and glycidyl cellulose were analyzed and characterized with FTIR, H-1-NMR, C-13-NMR, TGA, and GPC. During epoxidation of allyl cellulose, possible side reaction leading to ester formation was evidenced from the continuous increase of nu(C=O) at 1735 cm-1 in FTIR analyses. In addition, a bimodal distribution and a decreased molecular weight for glycidyl cellulose were found from GPC data, which might suggest a possible chain scission at the cellulosic ether linkage.