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  • Open Access

    ARTICLE

    HEAT TRANSFER ENHANCEMENT OF HEAT EXCHANGER INSERTED TWISTED PLATES FOR CARBON DIOXIDE GAS

    Makoto Shibahara*

    Frontiers in Heat and Mass Transfer, Vol.6, pp. 1-4, 2015, DOI:10.5098/hmt.6.9

    Abstract Overall heat transfer coefficients of the heat exchanger inserted twisted plates for CO2 were measured. The overall heat transfer coefficients increased with mass flow rates of water at the same Reynolds number in the experiment. It is considered that the helically twisting fluid motions in the twisted heat exchanger were contributed to the heat transfer enhancements. More >

  • Open Access

    ARTICLE

    Kinetics of the Demineralization Reaction of Deproteinized Lobster Shells Using CO2

    Miguel Ángel Ramírez1, Luis Alfonso, Patricia González2, Juan Reinerio Fagundo2, Margaret Suarez3, Clara Melian3, Tania Rodríguez1, Carlos Peniche4,*

    Journal of Renewable Materials, Vol.3, No.1, pp. 73-80, 2015, DOI:10.7569/JRM.2014.634116

    Abstract The demineralization kinetics of deproteinized lobster shells using CO2 were studied. Demineralization reaction proceeds until the concentration of Ca+2 in solution reaches an equilibrium value. The introduction of a cation exchange resin (cationite), in an open system for CO2 , allows replacement of the solution Ca2+ ions by Na+ ions, whereby the equilibrium shifts and an effective dissolution of the exoskeletons’ calcite is achieved. The mathematical relationships between the conductivity of the solution and the concentrations of major ions, the rate constants and kinetic parameters of the reaction in the absence and presence of the resin were obtained. More >

  • Open Access

    ARTICLE

    Bulk CO2-based Amorphous Triols Used for Designing Biocompatible Shape-Memory Polyurethanes

    Shunjie Liu1,2, Yusheng Qin1,*, Xianhong Wang1,*, Fosong Wang1

    Journal of Renewable Materials, Vol.3, No.2, pp. 101-112, 2015, DOI:10.7569/JRM.2014.634140

    Abstract Precursors with sharp crystalline transition temperature have attracted signifi cant attention in the fi eld of shape-memory materials; however, seldom have reports been related to amorphous ones with industrial application prospects. This study introduced a new family of amorphous CO2 -based hydroxyl-telechelic three-armed oligo(carbonate-ether) triol (Triol) with controllable molecular weight (Mn) and carbonate unit content (CU), which was coupled with PEG and 1,6-hexamethylene diisocyanate (HDI) to afford crosslinked polyurethanes (PU) networks with well-defi ned architecture. A crosslinking point was provided by Triol and PEG was used to afford networks some crystallinity. The resulting networks were characterized… More >

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