4377202 Rotary heat exchange apparatus provided with a spherically coiled heat transfer tube

This paper deals with mechanisms of heat transfer in a gas–solid fluidized bed. Heat transfer due to heat exchange by direct contact from a heat transfer tube immersed in the bed to fluidized particles was studied by means of visualization of contact of the fluidized particles to the heat transfer surface. The results show that the duration of contact of fluidized particles was almost uniform over the tube circumference and was hardly affected by the flow rate of fluidizing gas. On the other hand, the contact frequency between the particles and heat transfer tube was evidently influenced by the gas flow rate and particles diameter, as well as the location on the tube circumference. Using the visualized results, the amount of heat conducted to fluidized particles during the contact was estimated. This result showed that unsteady heat conduction to the fluidized particles plays an important role in the heat transfer, especially at the condition of incipient fluidization.

Download Full-text

Effect of Surface Heat Exchange Intensifier Geometry on Heat Transfer Tube Strength

Russian Aeronautics ◽

10.3103/s1068799819030036 ◽

2019 ◽

Vol 62 (3) ◽

pp. 373-380

Author(s):

I. A. Popov ◽

A. V. Shchelchkov ◽

R. A. Aksyanov ◽

A. N. Skrypnik ◽

S. A. Isaev

Keyword(s):

Heat Transfer ◽

Heat Exchange ◽

Surface Heat ◽

Heat Transfer Tube ◽

Transfer Tube ◽

Surface Heat Exchange ◽

Effect Of Surface

Download Full-text

TESTS OF FLAT HYDROTURBINE ROTATING A HEAT EXCHANGE TUBE

Modern Technologies and Scientific and Technological Progress ◽

10.36629/2686-9896-2020-1-11-12 ◽

2020 ◽

Vol 2020 (1) ◽

pp. 11-12

Author(s):

Aleksey Bal'chugov ◽

Borislav Kustov ◽

Natal'ya Kustova

Keyword(s):

Heat Transfer ◽

Heat Exchange ◽

Rotational Speed ◽

Hydraulic Turbine ◽

Vertical Tube ◽

Heat Transfer Tube ◽

Laboratory Bench ◽

Transfer Tube ◽

Heat Exchange Tube

Tests of a flat-blade hydraulic turbine designed to rotate a heat transfer tube at a laboratory bench have been performed. The dependence of the rotational speed of a hydraulic turbine in a vertical tube on the flow of water is determined.

Download Full-text

Numerical Analysis on Rib-Tubes of Seawater Open Rack Vaporizer With the Spoiler Lever

Polish Maritime Research ◽

10.1515/pomr-2017-0059 ◽

2017 ◽

Vol 24 (s2) ◽

pp. 14-21

Author(s):

Su Houde ◽

Yu Shurong ◽

Fan Jianling ◽

Wei Xing

Keyword(s):

Heat Transfer ◽

Tube Wall ◽

Small Difference ◽

Operating Temperature ◽

Operating Parameter ◽

Tube Model ◽

Heat Transfer Tube ◽

Transfer Tube ◽

Gasification Efficiency ◽

Gas Ratio

Abstract In order to explore a more reasonable structure and operating parameter, guide the design and improve the gasification of seawater Open Rack Vaporizer (ORV), Research on the rules of seawater that flows and heat transfer in the ORV tube was studied in this paper. By simplifying the model, heat transfer tube model with spoiler lever was obtained and simulated, the distribution of temperature field, gas ratio, velocity field and press field in rib tube were analyzed, and different inlet velocity of LNG, roughness of the tube wall both effected on the overall gasification, the results shows that the actual gasification efficiency from heat transfer tube is higher than normal, small difference of gas ratio outlet, velocity and temperature are both lower, LNG could be easer gasified at operating temperature between -162°C~+3°C than that between -162°C~+0°C.

Download Full-text