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Author: search.filters.author.Wisitsora-At, AnuratHas files: No

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    Design and simulation of flow cell chamber for quartz crystal microbalance sensor array
    (2010-07-30)
    Jaruwongrungsee, Kata
    ;
    Maturos, Thitima
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    Sritongkum, Pornpimol
    ;
    Wisitsora-At, Anurat
    ;
    Pintavirooj, Chuchart
    In this paper, the cause of significant variation in sensing responses of identical QCM sensors array in a circular QCM chamber is analyzed by fluid dynamic simulation. Moreover, the simulation is used to determine an appropriate shape of flow chamber for QCM sensor array. Simulation results show that the flow in a circular-shaped QCM chamber design is primarily turbulent. In addition, the degree of turbulence is increased with flow rate. Thus, sensors at various locations see different sample dispersions causing their sensing behaviors to be significantly different. The QCM chamber has been redesigned to be rectangular line and simulation results indicate that it can be the solution to the problem because flow in the new design is primarily laminar with uniform sample velocity.
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    Simulation and experiment of microheater for a microfluidic polymerase chain reaction device
    (2004-12-01)
    Klaitabtim, Don
    ;
    Lomas, Tanom
    ;
    Wisitsora-At, Anurat
    ;
    Tuantranont, Adisorn
    In this paper, we describe the simulation and experimental results of electroplated microheater for microfluidic-base polymerase chain reaction (PCR) device. This work used finite element analysis to simulate the temperature characteristics of a PCR device. The device consists of a reaction chamber using polydimethysiloxane (PDMS) with encapsulated micrhearter made of a nickel resistor wire. Design of the microheater mask layout using Tanner L-edit. Microheater can be made by low cost electroplating process. The temperature in the experiment was shown heating and cooling rates were 0.9°C/s and 0.8°C/s respectively. The thermal distribution of the device was also studied through finite elements modeling then compare to the experimental results. © 2004IEEE.