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	<title>MEMSuniverse &#187; atuador</title>
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		<title>Piezoelectric flow pump (bomba de fluxo piezelétrica)</title>
		<link>http://www.memsuniverse.com/microfluidics/bomba-de-fluxo-piezeletrica-piezoelectric-flow-pump.html</link>
		<comments>http://www.memsuniverse.com/microfluidics/bomba-de-fluxo-piezeletrica-piezoelectric-flow-pump.html#comments</comments>
		<pubDate>Thu, 03 Jan 2008 07:30:59 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Microfluidics]]></category>
		<category><![CDATA[atuador]]></category>
		<category><![CDATA[bilaminar]]></category>
		<category><![CDATA[bomba]]></category>
		<category><![CDATA[de]]></category>
		<category><![CDATA[flow]]></category>
		<category><![CDATA[fluxo]]></category>
		<category><![CDATA[piezelétrica]]></category>
		<category><![CDATA[piezelétrico]]></category>
		<category><![CDATA[Piezo]]></category>
		<category><![CDATA[piezoelectric]]></category>
		<category><![CDATA[pump]]></category>

		<guid isPermaLink="false">http://www.memsuniverse.com/?p=182</guid>
		<description><![CDATA[Piezoelectric Flow Pump Prototype, based on oscillatory principle. It consists in a bimorph piezoelectric actuator with a thin plate (fish tail shaped) applied over it. The bimorph piezoelectric actuator generates oscillatory motion under an electrical input of controlled frequency and amplitude. The oscillatory motion is &#8220;amplified&#8221; by the thin plate and generates the fluid (water) [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://img.youtube.com/vi/aG22hixnUNQ/2.jpg" align="left" /></p>
<p>Piezoelectric Flow Pump Prototype, based on oscillatory principle.<br />
It consists in a bimorph piezoelectric actuator with a thin plate (fish tail shaped) applied over it.<br />
The bimorph piezoelectric actuator generates oscillatory motion under an electrical input of controlled frequency and amplitude.<br />
The oscillatory motion is &#8220;amplified&#8221; by the thin plate and generates the fluid (water) flow.<br />
The application of the thin plate promoved a flow rate (cc/min) increase up to 40% in some cases, when compared to the performance  of the bimorph actuator by itself.<br />
During the experimental characterization phase it was noticed a great influence of the prototype channel profile over the water flow and consequently over the fluw pump performance.<br />
Due to its characteristics, that are low pressure and average flow rate, this kind of flow pump is basically applied on micro scale.<br />
Many tests, with different thin plate shapes were conduced. The best results were found with the thin plate presented in this video.</p>
<p>Protótipo de bomba de fluxo piezelétrica baseada no princípio oscilatório.<br />
Composto por um atuador piezelétrico bilaminar e uma carenagem em cobre (formato de cauda de peixe) colocada sobre o mesmo.<br />
O atuador piezelétrico gera movimentos oscilatórios sob a excitação de uma tensão elétrica de freqüência e amplitude controladas. Estas oscilações são &#8220;amplificadas&#8221; pela carenagem e produzem o deslocamento do fluido (água).<br />
O ganho em vazão(ml/min) obtido pela aplicação de uma carenagem chegou a até 40% em alguns casos, quando comparado ao desempenho obtido somente com o atuador bilaminar em operação.<br />
Durante os ensaios percebeu-se uma grande influência do formato do canal no escoamento do fluido e portanto no desempenho da bomba de fluxo.<br />
Este tipo de bomba tem como característica básica baixa pressão e vazão mediana (considerando sua aplicação em projetos de pequena escala).<br />
Foram realizados testes com diversos formatos de carenagem sendo a configuração de melhor desempenho mostrada no vídeo.</p>
<p>Duration : <strong>0:0:43</strong></p>
<p><span id="more-182"></span></p>
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