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Auteur A. Lindholdt
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Technical University of Denmark - Denmark
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Effects of biofouling development on drag forces of hull coatings for ocean-going ships : a review / A. Lindholdt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)
[article]
Titre : Effects of biofouling development on drag forces of hull coatings for ocean-going ships : a review Type de document : texte imprimé Auteurs : A. Lindholdt, Auteur ; Kim Dam-Johansen, Auteur ; S. M. Olsen, Auteur ; Diego M. Yebra, Auteur ; Søren Kiil, Auteur Année de publication : 2015 Article en page(s) : p. 415-445 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coques (architecture navale)
Essais (technologie)
Frottements (mécanique)
Salissures biologiques
Salissures marinesIndex. décimale : 667.9 Revêtements et enduits Résumé : This review presents a systematic overview of the literature and describes the experimental methods used to quantify the drag of hull coatings. It also summarizes the findings of hull coating’s drag performance and identifies the main parameters impacting it. The advantages and disadvantages of the reported methods listed in this review provide an assessment of the most efficient methods to quantify the drag performance of hull coatings. This review determines that drag performance of hull coating technology varies depending on whether the coating condition is newly applied, after dynamic or static seawater exposure. The summarized data reveal that, while several methods have attempted to quantify drag performance of hull coatings, other methods must be explored in order to accurately measure the long-term drag performance of hull coatings in conditions mimicking those that ship hulls encounter during actual voyages. Note de contenu : - DRAG PERFORMANCE OF HULL COATINGS : Principle of biocide-based antifouling coatings - Principle of fouling release coatings - Summary
- FUNDAMENTAL FLUID MECHANICS RELATED TO FLOW OF WATER OVER SHIP HULLS : Drag on a ship hull
- PARAMETERS IMPACTING TOTAL DRAG : Speed - Temperature of seawater - Salinity of seawater - Weather parameters : wind, waves, and current
- EXPERIMENTAL SETUPS FOR DETERMINATION OF SKIN FRICTION : Rotation disks - Rotating cylinders - Towing tanks - Water tunnels - Static and dynamic panel exposure tested on a boat - Pipes - Optical methods for drag measurements
- IMPACT OF THE COATINGS SURFACE CONDITION ON DRAG FORCES : Mechanical surface roughness - Newly applied hull coating condition - Biofouled hull coating condition - Drag performance development over time - Comparison between biocidal antifouling coatings and fouling release coatings
- THE IMPACT OF SHIPS' HILL COATING CONDITION ON DRAG
- CONTROL OF BIOFOULING BY HULL CLEANINGDOI : 10.1007/s11998-014-9651-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9651-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24169
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 3 (05/2015) . - p. 415-445[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17244 - Périodique Bibliothèque principale Documentaires Disponible Estimation of long-term drag performance of fouling control coatings using an ocean-placed raft with multiple dynamic rotors / A. Lindholdt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)
[article]
Titre : Estimation of long-term drag performance of fouling control coatings using an ocean-placed raft with multiple dynamic rotors Type de document : texte imprimé Auteurs : A. Lindholdt, Auteur ; Kim Dam-Johansen, Auteur ; D. M. Yebra, Auteur ; S. M. Olsen, Auteur ; Søren Kiil, Auteur Année de publication : 2015 Article en page(s) : p. 975-995 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcul
Encrassement
Essais dynamiques
Mesure
Résistance à la salissure
Revêtements antisalissures:Peinture antisalissures
Salissures biologiques
Salissures marinesIndex. décimale : 667.9 Revêtements et enduits Résumé : An experimental setup was designed and built to estimate changes in the skin friction of fouling control coatings (FCC) over an extended period of time in conditions simulating the vast majority of ship profiles (regarding speed and activity) in the present market. The setup consisted of two separate parts: one aged FCCs directly in seawater in a dynamic manner by simulating the exposure condition of a ship’s hull, and a second, laboratory part measured the torque (drag) of aged coatings in a rotary setup. From the spring to the autumn of 2013 and 2014, four commercial FCCs were exposed for 53 weeks in Roskilde Fjord, Denmark, which is characterized by relatively cold seawater and a salinity of approximately 1.2 wt%. The in situ immersion seawater conditions consisted of five-week cycles divided into 2 weeks of static immersion and 3 weeks of dynamic immersion, during which time the cylinders were rotated at a tangential velocity of 8.1 knots. The skin friction was found to generally increase more during the static period, compared to the dynamic ones. Over the course of the entire exposure period, the skin friction of the investigated FCCs decreased in the following order: fluorinated fouling release coating (FRC) (highest skin friction), hydrogel-based FRC without biocides, silylated acrylate self-polishing copolymer coating, and hydrogel-based FRC with biocides (lowest skin friction). However, the differences in skin friction between the latter three coatings were minor and often within the range of experimental uncertainty. The average surface roughness of the FCCs in the newly applied and mechanically cleaned condition, determined as the Rt(50) and R z parameters, was evaluated as poor predictors of skin friction. Note de contenu : - EXPERIMENTAL SETUP : Drag performance measurement setup - Aging setup - Measurement procedure
- MATERIALS AND SAMPLE PREPARATION : Surface roughness measurements
- CONVERSION OF TORQUE INTO FRICTION COEFFICIENTS : Conversion of laboratory torque values into friction coefficients for cylinders and flat plates - Estimation of the experimental uncertainty
- RESULTS AND DISCUSSION : Smooth cylinder - Material properties - Visual biofouling grading - Drag performance of fouling control coatings - Fuel and power predictions for a tankerDOI : 10.1007/s11998-015-9713-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9713-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24931
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 975-995[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17585 - Périodique Bibliothèque principale Documentaires Disponible