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  • 1
    Online Resource
    Online Resource
    Simulation of shell and tube heat exchanger using COMSOL software
    IOP Publishing ; 2021
    In:  IOP Conference Series: Earth and Environmental Science Vol. 947, No. 1 ( 2021-12-01), p. 012008-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 947, No. 1 ( 2021-12-01), p. 012008-
    Abstract: The aim of this paper is to propose a model to simulate the behaviour of water flows in shell and tube heat exchanger. Particularly, the continuity equation, the general heat transfer equations and the energy equation in COMSOL Multiphysics software were implemented in the numerical modelling. Besides, the experiment was also conducted to validate the proposed COMSOL model. The water temperature at locations close to the inlet and outlet of the shell side was respectively predicted at 31.5°C and 34.6°C in the simulation, and it was respectively measured at 31.5°C and 35°C in the experiment. These findings showed that the simulation results had a good agreement with the experiment. Next, this model was extended to simulate the overall heat coefficient and the pressure drops of the water flows in such heat exchanger. The overall heat coefficient was at 736.62 W/m 2 K. The pressure drops at the inlet/outlet areas of the shell and tubes were at 849.93 Pa and 6255.50 Pa, respectively. Conclusive evidence showed that the proposed model is a reliable method for studying the heat transfer behaviour of the shell and heat exchanger.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/947/1/012008
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2434538-6
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  • 2
    Online Resource
    Online Resource
    EFFECT OF TITANIUM SLAG PARTICLE SIZE ON THE ABILITY TO SYNTHESISE TiO₂ BY THE HYDROTHERMAL ALKALINE DISSOLUTION METHOD
    Institute of Rock Structure and Mechanics, AS CR ; 2023
    In:  Ceramics - Silikaty
    Details
    In: Ceramics - Silikaty, Institute of Rock Structure and Mechanics, AS CR
    Type of Medium: Online Resource
    ISSN: 0862-5468
    URL: Article
    DOI: 10.13168/cs.2023.0033
    Language: Unknown
    Publisher: Institute of Rock Structure and Mechanics, AS CR
    Publication Date: 2023
    detail.hit.zdb_id: 2061184-5
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  • 3
    Online Resource
    Online Resource
    Hydrodynamic studies on liquid-liquid two phase flow separation in microchannel by computational fluid dynamic modelling
    Viet Nam National University Ho Chi Minh City ; 2021
    In:  Science & Technology Development Journal - Engineering and Technology Vol. 4, No. 2 ( 2021-05-04), p. first-
    Details
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 2 ( 2021-05-04), p. first-
    Abstract: Microfluidic systems undergo rapid expansion of its application in different industries over the few decades as its surface tension-dominated property provides better mixing and improves mass transfer between two immiscible liquids. Synthesis of biodiesel via transesterification of vegetable oil and methanol in microfluidic systems by droplet flow requires separation of the products after the reaction occurred. The separation technique for multiphase fluid flow in the microfluidic system is different from the macro-system, as the gravitational force is overtaken by surface force. To understand these phenomena completely, a study on the hydrodynamic characteristics of two-phase oil-methanol system in microchannel was carried out. A multiphase Volume of Fluid model was developed to predict the fluid flow in the microchannel. An inline separator design was proposed along with its variable to obtain effective separation for the oil-methanol system. The separation performance was evaluated based on the amount of oil recovered and its purity. The capability of the developed model has been validated through a comparison of simulation results with published experiment. It was predicted that the purity of recovered oil was increased by more than 46% when the design with side openings arranged at both sides of the microchannel. The highest percentage recovery of oil from the mixture was simulated at 91.3% by adding the number of side openings to ensure the maximum recovery. The oil that was separated by the inline separator was predicted to be at 100% purity, which indicates that no methanol contamination throughout the separation process. The purity of the separated product can be increased by manipulating the pressure drop across the side openings. Hence, it can be concluded that the separation in a large diameter microchannel system is possible and methodology can be tuned to achieve the separation goal. Finally, the simulation results showed that the present volume of fluid model had a good agreement with the published experiment.
    Type of Medium: Online Resource
    ISSN: 2615-9872 , 2615-9872
    URL: Article
    DOI: 10.32508/stdjet.v4i2.810
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Thiết kế robot điều khiển camera di chuyển trên ray cho trường quay đài truyền hình
    Can Tho University ; 2021
    In:  Can Tho University Journal of Science Vol. 57, No. 2 ( 2021-04-30), p. 1-9
    Details
    In: Can Tho University Journal of Science, Can Tho University, Vol. 57, No. 2 ( 2021-04-30), p. 1-9
    Abstract: Từ khi mới hình thành cho đến nay, truyền thông truyền hình, là một phần không thể thiếu trong cuộc sống. Chất lượng cuộc sống ngày càng được nâng cao thì giải trí phục vụ cuộc sống cũng song song đi kèm. Ngoài chất lượng hình ảnh có độ nét ngày càng cao, hình ảnh phản ảnh lên nội dung chuyển tải cũng là một phần quan trọng. Đó là các thiết bị hỗ trợ máy quay giúp tạo nên các góc hình ảnh phản ảnh linh động, bao quát, không bị rung lắc sát thực nội dung mang đến người xem. Thiết bị hỗ trợ đó được đề cập đến trong bài báo này là hệ thống điều khiển camera di chuyển trên đường ray. Hệ thống này trước đây được áp dụng là một hệ thống thô sơ với hai người điều khiển thủ công và chiếm không gian lớn trong phạm vi trường quay và hoạt động rất bị động. Nghiên cứu này nhằm mục tiêu cải tiến với hệ thống điều khiển giúp camera chuyển động đúng ý mong muốn và đặc biệt là hoạt động ổn định, hình ảnh không bị rung lắc khi các động tác pan, tilt camera. Chức năng điều khiển tự động hoạt động ổn định của hệ thống được ứng dụng bằng bộ điều khiển PID (proportional integral derivative)...
    Type of Medium: Online Resource
    ISSN: 1859-2333 , 1859-2333
    URL: Article
    DOI: 10.22144/ctu.jvn.2021.031
    Language: Unknown
    Publisher: Can Tho University
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Modification of Lignocellulosic Materials with a Mixture of m -DMDHEU/Choline Chloride to Remove CrO 4 2– , NO 3 – , and H 2 AsO 4 – in Aqueous Solution
    American Chemical Society (ACS) ; 2020
    In:  ACS Omega Vol. 5, No. 29 ( 2020-07-28), p. 18313-18320
    Details
    In: ACS Omega, American Chemical Society (ACS), Vol. 5, No. 29 ( 2020-07-28), p. 18313-18320
    Type of Medium: Online Resource
    ISSN: 2470-1343 , 2470-1343
    URL: Article
    DOI: 10.1021/acsomega.0c01984
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 2020
    detail.hit.zdb_id: 2861993-6
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