Heat transfer characteristics of a focused surface acoustic wave (F-SAW) device for interfacial droplet jetting

Donghwi Lee, Namkyu Lee, Geehong Choi, Hyung Hee Cho

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this study, we investigate the interfacial droplet jetting characteristics and thermal stability of a focused surface acoustic wave device (F-SAW). An F-SAW device capable of generating a 20 MHz surface acoustic wave by applying sufficient radio frequency power (2–19 W) on a 128°-rotated YX-cut piezoelectric lithium niobate substrate for interfacial droplet jetting is proposed. The interfacial droplet jetting characteristics were visualized by a shadowgraph method using a high-speed camera, and a heat transfer experiment was conducted using K-type thermocouples. The interfacial droplet jetting characteristics (jet angle and height) were analyzed for two different cases by applying a single interdigital transducer and two opposite interdigital transducers. Surface temperature variations were analyzed with radio frequency input power increases to evaluate the thermal stability of the F-SAW device in air and water environments. We demonstrate that the maximum temperature increase of the F-SAW device in the water was 1/20 of that in the air, owing to the very high convective heat transfer coefficient of the water, resulting in prevention of the performance degradation of the focused acoustic wave device.

Original languageEnglish
Article number38
JournalInventions
Volume3
Issue number2
DOIs
Publication statusPublished - 2018 Jun

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Acoustic surface wave devices
Heat transfer
Transducers
Thermodynamic stability
Acoustic waves
Water
High speed cameras
Thermocouples
Air
Surface waves
Heat transfer coefficients
Lithium
Degradation
Temperature
Substrates
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "In this study, we investigate the interfacial droplet jetting characteristics and thermal stability of a focused surface acoustic wave device (F-SAW). An F-SAW device capable of generating a 20 MHz surface acoustic wave by applying sufficient radio frequency power (2–19 W) on a 128°-rotated YX-cut piezoelectric lithium niobate substrate for interfacial droplet jetting is proposed. The interfacial droplet jetting characteristics were visualized by a shadowgraph method using a high-speed camera, and a heat transfer experiment was conducted using K-type thermocouples. The interfacial droplet jetting characteristics (jet angle and height) were analyzed for two different cases by applying a single interdigital transducer and two opposite interdigital transducers. Surface temperature variations were analyzed with radio frequency input power increases to evaluate the thermal stability of the F-SAW device in air and water environments. We demonstrate that the maximum temperature increase of the F-SAW device in the water was 1/20 of that in the air, owing to the very high convective heat transfer coefficient of the water, resulting in prevention of the performance degradation of the focused acoustic wave device.",
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Heat transfer characteristics of a focused surface acoustic wave (F-SAW) device for interfacial droplet jetting. / Lee, Donghwi; Lee, Namkyu; Choi, Geehong; Cho, Hyung Hee.

In: Inventions, Vol. 3, No. 2, 38, 06.2018.

Research output: Contribution to journalArticle

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