Experimental Evaluation of Liquid Mixing Using Piezo Actuated Pump System
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HYSICAL INSTRUMENTS FOR ECOLOGY, MEDICINE, AND BIOLOGY
Experimental Evaluation of Liquid Mixing Using Piezo Actuated Pump System R. M. Ohola,* and B. Vasukia aDepartment
of Instrumentation and Control Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, 620015 India *e-mail: [email protected]
Received March 12, 2020; revised April 12, 2020; accepted April 13, 2020
Abstract—In present work, two piezo actuated cantilever beams are connected to a glass tube setup. The glass tube arrangement consists of the vertical tubes inserted in the liquid solutions, connector tubes, a glass bulb, and a helical tube, and it acts as a pump and mixer. When the piezo actuators are energized by AC voltage, vertical tubes start pumping the solution. At whatever point the two different solutions are in contact with each other in vibrating glass bulb and helical tube, mixing occurs. The proposed technique is a combination of active and passive mixers in which the liquid pumping action is utilized for fluid mixing. The diverse flowrates acquired at 65, 75, and 80 Vp-p are 0.038, 0.05012, and 0.06976 mL/s. UV-vis spectrophotometer tests mixed solutions for mixing performance. The important findings are, mixing performance depends upon two parameters, viz. solution concentration and flowrate. DOI: 10.1134/S0020441220050206
1. INTRODUCTION Liquid–liquid mixing (LLM) is an essential process in many industries such as food processing, pharmaceutical, chemical, waste-water treatment, biotechnology, paint industry, pulp and paper industry [1]. In any liquid mixing (LM) process, the non-uniformity in any one form such as concentration, phase or temperature, decreases until equilibrium occurs [2, 3]. The main aim of LLM is to reduce the mixing time and to increase the uniformity of two or three liquids in a specific limit [4]. Molecular diffusivity and viscosity are the important parameters on which the LM depends, in laminar flow conditions mixing occurs as a result of diffusion, but the coefficient of molecular diffusion was found to be reduced [5]. Hence, in consideration of biomedical applications it is essential to increase mixing performance [6–8].
To this context, various studies based on micro channel designs, i.e., active and passive mixers, have been performed [9, 10]. In the case of an active mixer, external energy (in the form of the electric field, magnetic field or acoustic field) is required as an input to improve the mixing performance [11]. Whereas in a passive mixer, due to their geometry of channel (zigzag channels, Y-type, and T-shape channels, curved tubes, angle bends) the mixing of fluid takes place without implementation of any external energy source [12, 13]. Furthermore, a small alteration in geometry of micro channel leads to an enhanced molecular diffusion and chaotic advection [14–16]. In present work the simplicity of the passive mixer in conjunction with active mixer was adopted for efficient mixing of two dye solutions (Methyl Red and Patent Blue V). To best of our knowledge this is the
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