Surface Heat Pumping

Gifford, W. E.; Longsworth, R. C.

doi:10.1007/978-1-4757-0522-5_18

Cited by 87 publications

(30 citation statements)

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“…Several theories have been developed to explain the refrigeration mechanism of PTRs since their invention. Gifford and Longsworth first explained the refrigeration effect in BPTR by a process named surface heat pumping [7], which is determined by both the thermal interactions between the wall of the BPTR and the properties of the working gas; however, this theory is only suitable for PTRs operating under low frequencies. Peter and Radebaugh [8] assumed that phase shift between pressure and the mass flow rate is the major mechanism for heat transfer in PTRs.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

et al. 2010

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a b s t r a c tThe objectives of this paper are to study the thermodynamic cycles in an inertance tube pulse tube refrigerator (ITPTR) by means of CFD method. The simulation results show that gas parcels working in different parts of ITPTR undergo different thermodynamic cycles. The net effects of those thermodynamic cycles are pumping heat from the low temperature part to the high temperature part of the system. The simulation results also show that under different frequencies of piston movement, the gas parcels working in the same part of the system will undergo the same type of thermodynamic cycles. The simulated thermal cycles are compared with those thermodynamic analysis results from a reference. Comparisons show that both CFD simulations and theoretical analysis predict the same type of thermal cycles at the same location. However, only CFD simulation can give the quantitative results, while the thermodynamic analysis is still remaining in quality.

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Section: Introductionmentioning

confidence: 99%

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

et al. 2010

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“…The pulse tube of Gifford and Longsworth [46] is shown in Figure A-13. Heat is pumped in the large open "pulse" tube whose diameter is a few thermal penetration depths.…”

Section: Figure A-12: Vortex Tubementioning

confidence: 99%

Energy Efficient Alternatives to Chlorofluorocarbons (CFCs)

1993

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“…Merkli and H. Thomann demonstrated 7 acoustic cooling in open tubes, and William Gifford and Ralph Longsworth exibited 8 cooling in their "pulse tube," which uses a low-frequency articulated cycle with large pressure changes. The engine shown in figure 2 consists of a stack of plates placed near the end of a closed tube.…”

Section: Physics Today / August 1985mentioning

confidence: 99%

“…Heat rejected by a, for example, is picked up by c' half a cycle later; that picked up by a' was rejected by b half a cycle earlier, and so forth. Heat is thus simply shuttled along the plate; this is the surface heat pumping described 8 by William Gifford and Ralph Longsworth for their "pulse tube." But at, for example, the right end, parcel d breaks contact on moving to d', so that it has the plate temperature at d, a hotter temperature by 7 1 , at d', and no heat transfer to the plate.…”

Section: A/2tt>x> \Xmentioning

confidence: 99%

Natural Engines

Wheatley

Cox

1985

Physics Today

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Under certain circumstances, a flow of heat through a system can give rise to acoustic oscillations, converting some of the heat to work. Natural vibrators maintained by heat flows have been studied since the 1770s. Some of the best-known examples come from acoustics: the “singing flames” first investigated by Byron Higgins in 1777, the Sondhauss tube and the Rijke tube. Most experimenters in cryogenics have observed the “Taconis oscillations” that occur when a tube, closed at the top, is inserted into a liquid-helium dewar. A group at Tsukuba has studied such oscillations quantitatively. Oscillations driven by heat also occur on a very large scale, in certain classes of variable stars.

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Surface Heat Pumping

Cited by 87 publications

References 1 publication

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

Energy Efficient Alternatives to Chlorofluorocarbons (CFCs)

Natural Engines

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