Browsing by Author "Karanth P, P.N."

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Experimental investigation on performance of disposable micropump with retrofit piezo stack actuator for biomedical application
(Springer Verlag service@springer.de, 2019) Mohith, S.; Karanth P, P.N.; Kulkarni, S.M.
Extensive researches are being conducted to develop miniaturized pumping systems to fulfill the need for accurate delivery of fluids at required rates, particularly in the biomedical field. This paper presents the design, fabrication, and testing of novel valveless micropump actuated through an amplified piezo actuator. The proposed model of the micropump pump has the unique feature of a disposable chamber and employs low-cost polymeric materials, conventional molding and machining operations for fabrication. The disposable part of the pump consists of a laser-cut pump chamber with nozzle/diffuser made of Polymethyl methacrylate (PMMA) and conventionally molded silicone rubber diaphragm. The retrofit part includes the amplified piezo actuator and support structures build from PMMA. Systematic characterization of the pump was carried with water and blood mimicking fluid to understand the effect of operating parameters such as driving frequency and actuation voltage on flow rate and back pressure of the micropump. Experimental results show that the proposed design was capable of pumping 3.3–3.4 ml/min of dye solution and 1.7–1.75 ml/min of blood mimicking fluid at a driving frequency of 5 Hz and actuation voltage of 150 V. The corresponding computed volume resolution/stroke of the pump was found to about 5.75 µl and 11.25 µl of blood mimicking fluid and dye solution, respectively. The proposed pump was found to work effectively against a maximum back pressure of 156 Pa with blood mimicking fluid and 250 Pa with the dye solution as the working fluid under the same operating condition of 5 Hz and 150 V. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
Investigation of errors in microcontroller interface circuit for mutual inductance sensor
(Elsevier B.V., 2019) Anarghya, A.; Rao, S.S.; Herbert, M.A.; Karanth P, P.N.; Rao, N.
This paper proposes direct microcontroller interface circuit on Arduino platform, which is realized using the inductive sensors. The circuit is composed of two external resistors and two reference inductors resulting in four RL circuits. The microcontroller independently excites the two RL circuit on the primary side in order to measure the discharging time of voltage across each inductor. The discharging time of voltage across the inductors on the secondary side is measured similarly which is excited due to mutual inductance from the primary side. The technique of time-to-digital conversion from the built-in timer of microcontroller enables estimation of inductance value, which is compared with the actual value for self-inductance and mutual inductance circuits. Error analysis on the discharge time measurement are performed viz, parasitic resistance, parasitic capacitance on input–output ports along with ringing effects and relative quantization error. The resistance and inductance estimation with regards to varying time period of oscillation of crystal is performed to analyze the effect of oscillation frequency on estimation. The parasitic resistance and quantization effects both contribute to the non-linearity errors (NLE) which is investigated further experimentally. The optimum value of the resistance was observed to be 120? and 60? for the primary and secondary side respectively. For primary side, the current and power consumption is 29 mA and 145 mW respectively, while for the secondary side, the current and power consumption is 27.5 mA and 137.5 mW respectively. The maximum NLE of ?0.18 %FSS and ?0.24 %FSS has been observed for an inductance range of 1 mH–10 mH along both primary and secondary sides respectively, whereas for an inductance range of 10 mH–100 mH, the NLE achieved was 0.29 %FSS and ?0.34 %FSS for the primary and secondary sides respectively. The future scope of the linear position displacement of the inductive sensor concludes the paper. © 2018 Karabuk University
Modeling of single and multilayer polyvinylidene fluoride film for micro pump actuation
(2010) Karanth P, P.N.; Desai, V.; Kulkarni, S.M.
Micro pumps are essential components of micro devices such as drug delivery systems. Large numbers of pumps have been proposed based on different actuating principles. Piezoelectric actuation offers advantages such as reliability and energy efficiency. Lead zirconate titanate (PZT) based piezoelectric actuation for micro pumps is predominantly explored despite its disadvantages such as brittle nature, low straining and difficulties in processing. Polymer piezoelectric materials like polyvinylidene fluoride (PVDF) could be promising replacements for PZT owing to their availability in form of films and good strain coefficients. Very limited literature on micro pump with PVDF as an actuator is available. In this paper, finite element analysis (FEA) model of a micro pump actuator using single and multilayer PVDF for actuation is developed in ANSYS. The model takes into account the influence of driving voltage and actuator. Copyright © Springer-Verlag 2009.
Recent trends in mechanical micropumps and their applications: A review
(Elsevier Ltd, 2019) Mohith, S.; Karanth P, P.N.; Kulkarni, S.M.
In recent years micropump technology has gained considerable importance and has become the highlighted area of research particularly for microfluidic applications. The driving force towards the development of micropump technology has been the integration of pumping systems into microfluidic devices to fulfill the need for accurate delivery of fluids. The present review brings out the recent research and development in the field of micropump technology with an emphasis on mechanical micropump. This review highlights the complete history and descriptions of different mechanical micropump design, actuation principles, materials and performance/operating parameters with relevant schematic diagrams. A comparative study with quantitative and graphical data has been presented to address the potential advantages and disadvantages of the different actuation schemes of mechanical micropump with the emphasis on flow rate and back pressure developed. Factors such as actuator type, operating parameters, diaphragm materials, and flow rectification mechanisms and their effect on micropump performance are addressed in detail. This study also highlights the requirements and applications of micropump in different fields such as biomedical, drug delivery, thermal management, fuel cells, etc. © 2019 Elsevier Ltd