Advanced Materials Research Vols. 781-784

Abstract: In this work, the innovative starch microcapsules enclosed with hydrophobic carnauba wax were developed, which were applied to the modification of cellulose fibers, thus increasing the water resistance of paper by reducing water vapor transmission rate (WVTR). Carnauba wax being encapsulated by crosslinking starch was confirmed by thermogravimetric analysis. The sizes of carnauba wax-starch microcapsules depended on the weight ratio (R) of starch to carnauba wax and concentration of crosslinker. The best performance on water vapor barrier of the paper was achieved by the fibers treated with the microcapsules of larger size. The lowest WVTR was given by the handsheet treated by wet-end addition with carnauba wax-starch microcapsules at R_{starch/ carnauba} wax=5%, and R _{crosslinker/ carnauba wax}=50%, and had a value of 348 g/m²day, a 70% drop from untreated original paper which has a WVTR value of 1176 g/m²day.

Abstract: Two-dimensional numerical investigations on the performance and structure improvement of a inert porous media burner with reciprocating flow are presented. An improved burner design is proposed and this leads to a wider high temperature profile and moderate pressure loss for extremely dilute CH4/air mixture with an equivalence ratio of 0.1.

Abstract: Proposed an accuracy estimation method combined thin films section of hot disk thermal constants analyzer and Fourier transform formula, saves the requirement that heat capacity must be given in advance when use anisotropic model hot disk thermal constants analyzer to test the thermal conductivity of materials with coating. Use the anisotropic model of hot disk thermal constants analyzer and heat transfer experiment to testify the accuracy of this method.

Abstract: The interfacial reactions and thermodynamic properties of the emulsion liquid membrane on separation and concentration of chromium (III) were discussed. Interfacial chemical reaction equations of membrane phase with P204 and mass transfer mechanism of ELM system were determined. The extraction reaction enthalpy is 11.41 kJmol¹, while stripping reaction enthalpy is-143.65 kJmol¹, were obtained by investigating reaction temperature on the distribution ratio under two different conditions. So extraction is an endothermic process and stripping is an exothermic process. And the main driving force of the separation system is the concentration gradient of hydrogen ion between external and internal phase interface.

Abstract: Diffusion filtration combustion attains widely attention as its small volume, compact structure, large power range and less emissions which is very important for saving energy in recent years. It is the combustion that fuel and oxidant are separated before burning in porous media. The researches about diffusion filtration combustion are summarized the theory, experiment and numerical simulation in this paper. There is still much knowledge unknown which should be worked on.

Abstract: Numerical simulation method were performed to comparatively study the heat transfer and resistance characteristics of smooth tubetransversal and longitudinal flow circular fin tube and longitudinal flow slotted umbrella fin tube; researched the flowheat transfer and resistance characteristics of longitudinal flow slotted umbrella fin tube with five different fin angle. Results show that, with the same piping mode and Re number, heat transfer coefficient of longitudinal flow slotted umbrella fin tube is 1.4~1.8 times of smooth tube, heat transfer coefficient of transversal and longitudinal flow circular fin tube is 1.1~1.5 times of smooth tube, longitudinal flow slotted umbrella fin tube with α=105° has the best heat transfer coefficient; the resistance of longitudinal flow slotted umbrella fin tube is 0.25~0.75 times of transversal flow circular fin tube, and higher than longitudinal flow circular fin tube, longitudinal flow slotted umbrella fin tube with α=105° has the lowest resistance of all slotted umbrella fin tubes.

Abstract: The mixed arrangement irregular heat-pipe flue gas heat transfer was researched, using numerical simulation method. The irregular heat-pipe: triangle heat pipe; square heat pipe. The heat pipe equivalent diameter of flue gas heat transfer is 20 mm, the speed of inlet flue gas is 11 m/s, the inlet temperature of flue gas is 500 K. the results show mixed arrangement irregular heat-pipe can enhance heat exchanging, the optimal parameters of mixed arrangement structure in the condition of given working condition: the first row is triangle heat pipe, the second row is circular heat pipe, the third row is triangle heat pipe, row 4 is square heat pipe, the line spacing of the first row and second is 40 mm, the line spacing of the second and third row is 40 mm, the line spacing of the third row and the fourth row is 35 mm, and the row spacing of the tube is 40 mm. the heat transfer efficiency of the optimized irregular heat-pipe-exchanger raised 40 ~ 60%.

Abstract: The paper is on research of the operating characteristic of the ground source heat pump air conditioning system that applied in large scale gymnasium in hot summer and warm winter zones, combining with operating characteristic of the real application of the GX autonomous region's gymnasium project. Utilizing the SPSS software aiding the Multivariate nonlinear Regression analysis, via MATLAB's optimization methods for optimizing and stimulating to obtain the most economic, practical and reliable mode and the optimal system parameter. The purpose of this research lies in making it available for the system to exert its best working condition and providing reference for real project design.

Abstract: Taking one multifunction building in Guangxi as example. The paper introduces the author team who independent design and imply a ground-source heat pump (GSHP) and cooling tower hot water and air-condition joint supply system (GCHAS) which application in a multifunction building in hot summer and warm winter zone. The system performance is analyzed through the experiment. And the result of experiment proves the superiority and economy of ground-source heat pump technique in multifunction building. The author also research how to realize the energy saving and comprehensive application of ground-source heat pump work in multifunction building.

Abstract: The static gas wave refrigerator (SGWR) was a very important fluid machine in process of conveying natural gas.Its operating performance depended on characteristic of fluidic attachment and switch. This paper introduced fluidic entrainment and attachment phenomenon and analysed computational model of fluidic attachment. In order to study characteristic of fluidic attachment, the governing equation was two-dimension, unsteady and compressible N-S equation with k-ε turbulent model. The flow space was divided with two-dimention nonstructureing mesh. The results showed that the fluidic entrainment phenomenon was seized and Coanda effect was proved. The whole process of the fluidic attachment and switch were simulated and the mechanism of the fluidic switch was detailedly analysed based on the results.