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- 저자 : Kalendar, (검색결과 3 건)
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Enhanced tubing thermal performance for innovative MSF system
A. Kalendar,T. Galal,A. Al-Saftawi,M. Zedan 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.8
Existing MSF systems experience severe mechanical difficulties due to fouling deposited inside the bore of the condenser tubes. The idea of replacing smooth tubing with enhanced tubing is discussed for innovative design. Performance analysis between enhanced and plain tubes is investigated experimentally, using a simulated design test rig. The study is performed for corrugated and smooth resemblance aluminum-brass tubes of 1100 mm length and 23 mm bore. Pumping different coolants as steady transition/turbulent flow, fresh water and authentic brine are conducted to simulate actual environmental conditions. Three different flow velocities are examined: 0.1,0.1645, and 0.2398 m/s. Comparing results of the brine with that of fresh water shows the effects of fouling on significantly lowering values of overall heat transfer coefficient versus time. The results confirm that the smooth tube has a greater fouling tendency than the corrugated tube. The effect of fouling is reduced as flow speed increases, and consequently, the asymptotic value of overall heat transfer coefficient U* increases. Values of U* for the enhanced tube are much higher than that of the smooth tube. The highest difference occurs at velocity 0.2398 m/s by a factor of about 1.5. Overall, by utilizing real brine, the results proved that heat performance of the employed corrugated tube is superior to the plain, over the studied time period, 140 hrs, and on the studied range of flow speeds.
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Heat transfer performance of condenser tubes in an MSF desalination system
T. Galal,A. Kalendar,A. Al-Saftawi,M. Zedan 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.11
The present research examines the amount of condensed fresh water off the outer-side surface of heat exchangers in an MSF system. The quantitative modeling of condensed water on the outer surface of comparable tubes, enhanced and plain, in a simulated MSF technique is investigated. An adapted simulation design on a test-rig facility, accounting for the condenser tubing in actual industrial desalination plate-form, is used with corrugated and smooth aluminum-brass material tubes 1100mm long and 23mm bore. A singlephase flow of authentic brine water that typifies real fouling is utilized to simulate the actual environmental life of a multi-stage flashing desalination system, with coolant flow velocity 0.1 m/s in the two delineated types of condenser tubing. It is demonstrated that the condensate water amount from the specified enhanced tube is about 1.22 times the condensate water amount from the smooth tube, adaptive for 140 running hours under deliberated constrains. The topic covers a comparative analysis of thermal performance. Comparing results with fresh water confirm the effect of fouling on significantly lowering the value of the overall heat transfer coefficient versus time. Fouling resistance Rf is reported with the critical coolant flow speed of 0.1 m/s. Comparison between the fouling resistance for both smooth and corrugated tubes versus time is performed. The fouling thermal resistance of the corrugated tube is 0.56 of the fouling thermal resistance of the smooth tube after140 running hours of the experiment are concluded. Overall, in the case of real brine, results prove that heat performance for the corrugated tube is superior to the plain tube over the studied time period (140 hrs) for the chosen range of flow speeds.
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Genome Constitution and Classification Using Retrotransposon-Based Markers in the Orphan Crop Banana
( Chee How Teo ),( Siang Hee Tan ),( Chai Ling Ho ),( Qamaruz Zaman Faridah ),( Yasmin Rofina Othman ),( John Seymour Heslop Harrison ),( Ruslan Kalendar ),( Alan Howard Schulman ) 한국식물학회 2005 Journal of Plant Biology Vol.48 No.1
We have exploited the repetitive and dispersed nature of many long terminal repeat (LTR)-retrotransposon families for characterizing genome constitutions and classifying cultivars of the genus Musa. Insertional polymorphisms of the elements were studied using seven published and two newly designed primers facing outwards from the LTRs and reverse transcriptase (RT) domain of the retrotransposon. The primers generated specific amplification patterns showing the universal applicability of this marker type. The Inter-Retrotransposon Amplified Polymorphism (IRAP) markers distinguished the A and B genomes of the banana species (Musa acuminata Colla and Musa balbisiana Colla) and between banana cultivars. The IRAP markers enabled phylogenetic analysis of 16 Malaysian banana cultivars and determination of the genome constitution of hybrid banana (AAB, ABB, AABB, and AAAB), and gave information about ancestral genotypes of the hybrids. In addition, the TRAP detected new retrotransposon insertions into the genome of tissue culture regenerants. This PCR-based IRAP assay is amenable to large-scale throughput demands in screening breeding populations and is applicable for any crop.
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