Heat Transfer in a Liquid Metal Flowing Turbulently through a Channel with a Step Function Boundary Temperature

An analytical heat transfer solution is derived and evaluated for the general case of a turbulently flowing liquid metal which suddenly encounters a step-function boundary temperature in a channel system. Local Nusselt moduli, dimensionless mixed-mean fluid temperatures, and arithmetic-mean Nusselt moduli are given as functions of Reynolds and Prandtl moduli and a dimensionless axial-distance modulus. These solutions are compared with known solutions of more specific systems as well as with a set of experimental liquid-metal heat transfer data for a thermal entrance region

SNAP-8 boiler performance degradation and two-phase flow heat and momentum transfer models

SNAP-8 boiler performance degradation and two phase flow heat and momentum transfer model

Development of a prototype fluid volume measurement system

The research is reported in applying the axial fluid temperature differential flowmeter to a urine volume measurement system for space missions. The fluid volume measurement system is described along with the prototype equipment package. Flowmeter calibration, electronic signal processing, and typical void volume measurements are also described

Dynamic analysis of a lithium-boiling potassium refractory metal Rankine cycle power system for the Jet Propulsion Laboratory

Lithium-boiling potassium refractory metal Rankine cycle power system heat transfer model

Development of downhole geothermal heat flux and thermal conductivity transducers

Two new transducers were developed which can be used in exploration holes to measure downhole geothermal heat fluxes and earth thermal conductivities. The first step in this effort consisted of analytically describing the performance characteristics of the transducers. Next, models of the transducers were built and tested in the laboratory, verifying the measurement concepts involved. Then a survey was made of possible sites where full-scale transducers could be tested in exploration holes. The two transducers were then fabricated and the test plan developed. Although some technical background material is outlined for the two transducers, the report primarily describes (1) the transducer field test effort at Middletown, (2) the downhole measurements made, and (3) the geothermal heat flux and thermal conductivity data derived from the transducer measurements. The results obtained by the two transducers are compared to each other and to other pertinent data

Transient Response of a Hollow Cylindrical-Cross-Section Solid Sensible Heat: Storage Unit- Single Fluid

plosion which have been interpreted in terms of the kinetic theory of nucleation can likewise be viewed in terms of film boiling destabilization with attendant fine scale fragmentation of the hot material. Vol. 77, No. 23, 1973, pp. 2730-2736 26 Cronenberg, A. W., Benz, R., to be published, Advances in Nuclear Science and Technology, 1978. 27 Anderson, R. P., Armstrong, D. R., ASME Meeting on Nuclear Reactor Safety Heat Transfer, Atlanta, Ga., Nov. 1977. 28 Henry, R. E., Fauske, H. K., McUmber, L. M., Proceedings of ANS Conference on Fast Reactor Safety, Chicago, 111. (Oct. 1976). Conclusions 29 Fauske, H. K., Nuclear Science and Engineering, Vol. 51, 1973, pp. 95-101. 30 Fauske, H. K., Reactor Technology, Vol. 15, No. 4, 1972-1973 3

Thin rod heat flux transducer positioned in the earth having a uniform temperature gradient: a closed form solution

Signals from a thin rod heat flux transducer will be measured and translated into a geothermal heat flux. A mathematical temperature solution has been developed for an idealized thin rod positioned in an infinite solid with a uniform temperature gradient. This solution approximates the actual temperature to be encountered in the transducer when located in a drillhole. The solution is a closed form type for a thin rod wherein radial temperature differences are small compared to axial ones; the system can be classified as a fin with a variable environmental temperature gradient. The resulting temperature field is evaluated for a range of system parameters that are of interest in geothermal heat flux measurement. A description of how the mathematical results obtained will be used to extract the unknown geothermal heat flux and earth thermal conductivity from the experimental temperature information obtained by the heat flux transducer is also presented. In addition, the solution is extended to the case where there is a water or air annulus space between the transducer and the drillhole

Laboratory tests for a model thin rod heat flux transducer

A model of a thin rod heat flux transducer was constructed for the purpose of performing some laboratory performance verification tests (prior to shallow hole testing). The model was installed in a sand volume that had a controlled vertical linear temperature gradient at its boundary. At steady state, transducer thermopile outputs and peripheral vertical sand temperature gradients were measured. From the rod heat flux transducer theory previously developed and these measurements, the thermal conductivity and vertical heat flux were extracted. The thermal conductivity results were compared with known measured volues for the sand