Rotating heat pipe

The experts believe that all the technologies studied such as heat pipes, rotating equipment, and enhancement devices may approach the growth stage in the medium term around 2010 to 2015. 

The most common type of air preheater on new units is the rotating wheel. On retrofits, heat pipes or hot-water loops are often more cost-effective because of ductwork costs or space limits. 

Borehole depth 10,000 ft, deviated hole Drill pipe rotation rate 10 rpm Mud heat capacity 0.77 cal/g Hole diameter 12 in. 

Escoe, A. K. Mechanical Design of Process Equipment, Vol. 1. Piping and Pressure Vessels. Vol. 2. Shell-and-tube Heat Exchangers, Rotating Equipment, Bins, Silos and Stacks (Gulf, 1986). 

Y. Mori and W. Nakayama, Forced Convection Heat Transfer in a Straight Pipe Rotating Around a Parallel Axis, Int. J. Heat Mass Transfer (10) 1179-1194,1967. 

P. J. Marto, Rotating Heat Pipes, in D. E. Metzger and N. H. Afgan (eds.), Heat and Mass Transfer in Rotating Machinery, Hemisphere Publishing Corp., New York, pp. 609-632,1984. 

Doppler-free two-photon spectroscopy or with two-step excitation (Sect. 5.4). For illustration, Fig. 8.5 illustrates pressure broadening and shifts of a rotational transition to a Rydberg level of the Li2 molecule measured with Doppler-free OODR polarization spectroscopy (Sect. 5.5) in a lithium/argon heat pipe [980], where the intermediate level B(v, J ) was pumped optically by a circularly polarized pump laser. For the chosen temperature and pressure conditions the argon is confined to the cooled outer parts of the heat pipe, and the center of the heat pipe contains pure lithium vapor (98 % Li atoms and 2 % Li2 molecules) with a total vapor pressure p(Li) = p(Ar) up to argon pressures of 0.7 mbar. The observed pressure broadening and shift in this range p < 0.7 mbar are therefore caused by Li + Li collisions. 

Fig. 13.5. Pressure broadening left scale) and shift (right scale) of a Doppler-free rotational line in the Rydberg system 6d8 of the Li2 molecule in a heat pipe for...

Figure 1.4 The basic rotating heat pipe concept (Daniels et al., 1975).

There is a suggestion that peak heat fluxes in the evaporators of rotating heat pipes increase as the one-fourth power of acceleration (Costello and Adams, 1960). While the condenser performance has been less well documented, high G forces allow very thin film thicknesses and continuous irrigation of the surface, reducing the thermal resistance across it. Because of the sealed nature of heat pipes and other rotating devices, even further enhancement of condenser performance could be achieved by promoting drop-wise condensation. 

An application of a rotating boiler, and all other components in the rotating heat pipe described above, is in a rotating air conditioning unit. Illustrated in Figure 1.5, the... 

Figure I. S The rotating air conditioning unit, based upon heat pipes.

One could envisage the rotating fin as being hollow but not connected to the main vapour space. This could then act as another rotating heat pipe, in series with the main unit, to aid dissipation. 

As with the rotating heat pipe which generates its own gravity field, a rotating reactor also does this when conceived for experiments in space. Most frequently these... 

Daniels, T.C. and Al-Jumaily, F.K. (1975). Investigations of the factors affecting the performance of a rotating heat pipe. Int. J. Heat and Mass Transfer, Vol. 18, pp. 961-973. Goebel, P. (1977). Polymerisation reactor with gilled-tube radiator and axial agitator. US Patent 4029143, 14 June. 

Gray, V.H. (1969). The rotating heat pipe - a wickless, hollow shaft for transferring high heat fluxes. ASME Paper 69-HT-19, ASME, New York. 

ROTATING HEAT PIPE COOLING TECHNIQUE WITH SELF-EVAPORATING CIRCULATING LIQUID FOR ROTOR IN CONTINUOUS MIXER... 

Indirect-Heat Rotary Steam-Tube Dryers Probably the most common type of indirec t-heat rotaiy diyer is the steam-tube diyer (Fig. 12-69). Steam-heated tubes running the full length of the cylinder are fastened symmetrically in one, two, or three concentric rows inside the cylinder and rotate with it. Tubes may be simple pipe with condensate draining by gravity into the discharge manifold or bayonet-type. Bayonet-type tubes are also employed when units are used... 

The Guidelines for Process Equipment Reliability Data with Data Tables covers a variety of components used in the chemical process industry, including electrical equipment, analyzers, instrumentation and controls, detectors, heat exchangers, piping systems, rotating equipment (pump, compressor, and fan), valves, and fire protection systems. 

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