Thermoacoustic engines

Swift, G. W.

doi:10.1121/1.396617

Cited by 967 publications

(586 citation statements)

References 0 publications

Supporting

Mentioning

571

Contrasting

Unclassified

Order By: Relevance

“…This maximum (ξ a − g)/(σL) is not always possible due to the limit in the excursion of the acoustic driver. Swift [16] recommended that heat exchangers should have a length equivalent to the peak-to-peak displacement amplitude, in order to have a big enough heat transfer area for a given flow velocity, while not a big penalty of friction loss. This corresponds to (ξ a − g)/(σL) = 0.5.…”

Section: Methodsmentioning

confidence: 99%

Thermal performance of finned-tube thermoacoustic heat exchangers in oscillatory flow conditions

Kamsanam

Mao

Jaworski

2016

International Journal of Thermal Sciences

View full text Add to dashboard Cite

Heat exchangers play a key role in the overall performance of thermoacoustic devices. Due to the complex nature of oscillatory flows, the underlying mechanism of heat transfer in oscillatory flows is still not fully understood. This work investigates the effect of fin length and fin spacing on the thermal performance of finned-tube heat exchangers. The heat transfer rate between two finned-tube heat exchangers arranged side-by-side in an oscillatory flow was measured over a range of testing conditions. The results are presented in terms of heat transfer coefficient and heat transfer effectiveness. Comparisons are made between experimental results of this work and a number of models, such as, the Time-Average Steady-Flow Equivalent (TASFE) model, the Root Mean Square Reynolds Number (RMS-Re) model and the boundary layer conduction model, as well as several empirical correlations in literature. A new empirical correlation is proposed to be used for the prediction of thermal performance for finned-tube heat exchangers in oscillatory flows. The uncertainties associated with the measurement of heat flux are estimated.

show abstract

Section: Methodsmentioning

confidence: 99%

Thermal performance of finned-tube thermoacoustic heat exchangers in oscillatory flow conditions

Kamsanam

Mao

Jaworski

2016

International Journal of Thermal Sciences

View full text Add to dashboard Cite

show abstract

“…With the help of the Young's modulus approximation (15) we can express the straintemperature graph shown in Figure 4.…”

Section: Dynamical Modelling Of Sma-pehmentioning

confidence: 99%

“…Thermoacoustic heat engines, thermomagnetic engines, hydride heat generators can be divided into two groups: traveling wave, and standing wave devices [13][14][15]. Thermomagnetic engines rely on the change of magnetization of certain materials that occurs with change in temperature [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Modelling and Investigation of a Hybrid Thermal Energy Harvester

et al. 2018

View full text Add to dashboard Cite

Abstract. The presented paper deals with dynamical and experimental investigations of a hybrid energy harvester containing shape memory alloy (SMA) wire and elastic cantilever with piezoelectric layer. The SMA wire periodically changes its temperature under the influence of a heated plate that approaches and moves away from the SMA wire. The change of SMA wire length causes rotation of the hot plate. The plate is heated by a heater with constant temperature. The repeated SMA wire extensions and contractions bend the piezoelectric cantilever which generates electric charges. The shape memory effect is presented as a temperature approximation of the Young's modulus. A dynamical model of the energy harvester is created and some analytical investigations are presented. With the help of an experimental setup the acceleration, the force, the temperature, and the output voltage have been measured. The theoretical results are validated experimentally. Some conclusions are made about the best performance of the energy harvester.

show abstract

“…This is caused by the heat interaction between a solid material and adjacent gas at the thermal penetration depth of the compressible oscillatory flow. Essential theoretical aspects of thermoacoustics have been provided by Rott [1], while further theoretical analyses and experimental investigations have been performed by Swift [2].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a traveling wave thermoacoustic engine in a looped-tube

Novotný

Hsu

Wang

et al. 2014

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. In the present paper, four configurations of a traveling wave thermoacoustic engine in a looped tube were investigated by means of theoretical calculations and experiments. The effect of natural heat convection on their functionality was observed. Acoustic intensity was measured using a dual two microphone method. The stack was designed with few times higher dimension of channels than thermal penetration depth, due to the stack should not be called regenerator. Pressure distribution in the resonator was measured, and a good agreement with theoretical calculations from DELTAEC has been demonstrated.

show abstract

Thermoacoustic engines

Cited by 967 publications

References 0 publications

Thermal performance of finned-tube thermoacoustic heat exchangers in oscillatory flow conditions

Thermal performance of finned-tube thermoacoustic heat exchangers in oscillatory flow conditions

Modelling and Investigation of a Hybrid Thermal Energy Harvester

Investigation of a traveling wave thermoacoustic engine in a looped-tube

Contact Info

Product

Resources

About