Direct Contact Gas-Liquid Heat Exchange for Energy Recovery

1990 ◽  
Vol 112 (3) ◽  
pp. 216-222 ◽  
Author(s):  
James R. Fair
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Exchange ◽  
Experimental Work ◽  
Direct Contact ◽  
Energy Recovery ◽  
Gas Discharge ◽  
Transfer Data ◽  
Hot Gas ◽  
Liquid Heat

Energy from hot gas discharge streams can be recovered by transfer directly to a coolant liquid in one of several available gas-liquid contacting devices. The design of the device is central to the theme of this paper, and experimental work has verified that the analogy between heat transfer and mass transfer can be used for design purposes. This enables the large amount of available mass transfer data for spray, packed, and tray columns to be used for heat transfer calculations. Recommended methods for designing the several types of gas-liquid contacting device are summarized.

Heat and Mass Transfer in an Incompressible Turbulent Boundary Layer

1972 ◽  
Vol 94 (1) ◽  
pp. 23-28 ◽  
Author(s):  
E. Brundrett ◽  
W. B. Nicoll ◽  
A. B. Strong
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Mass Transfer ◽  
Porous Plate ◽  
Mixing Length ◽  
Two Dimensional ◽  
Transfer Data ◽  
Incompressible Turbulent Boundary Layer ◽  
Wide Range ◽  
Incompressible Boundary

The van Driest damped mixing length has been extended to account for the effects of mass transfer through a porous plate into a turbulent, two-dimensional incompressible boundary layer. The present mixing length is continuous from the wall through to the inner-law region of the flow, and although empirical, has been shown to predict wall shear stress and heat transfer data for a wide range of blowing rates.

Direct Contact Heating of Fermentors by Rotational Hot Gas Discharge System

2002 ◽  
Author(s):  
Yutaka Kitamura ◽  
Tung Liang ◽  
Dan Paquin ◽  
Loren Gautz
Keyword(s):  
Direct Contact ◽  
Gas Discharge ◽  
Discharge System ◽  
Hot Gas ◽  
Contact Heating

Mechanisms of Heat Transfer Enhancement of Gas–Solid Fluidized Bed: Estimation of Direct Contact Heat Exchange From Heat Transfer Surface to Fluidized Particles Using an Optical Visualization Technique

1995 ◽  
Vol 117 (1) ◽  
pp. 104-112 ◽  
Author(s):  
Y. Kurosaki ◽  
I. Satoh ◽  
T. Ishize
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Fluidized Bed ◽  
Flow Rate ◽  
Direct Contact ◽  
Heat Transfer Surface ◽  
Heat Transfer Tube ◽  
Transfer Tube ◽  
Contact Frequency ◽  
Fluidized Particles

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.

Heat Transfer in 1:4 Rectangular Passages With Rotation

2003 ◽  
Vol 125 (4) ◽  
pp. 726-733 ◽  
Author(s):  
Peeyush Agarwal ◽  
Sumanta Acharya ◽  
D. E. Nikitopoulos
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Cross Section ◽  
Rectangular Channel ◽  
Transfer Data ◽  
Naphthalene Sublimation Technique ◽  
Rotation Numbers ◽  
Local Mass Transfer ◽  
Naphthalene Sublimation ◽  
Sublimation Technique

The paper presents an experimental study of heat/mass transfer coefficient in 1:4 rectangular channel with smooth or ribbed walls for Reynolds number in the range of 5000–40,000 and rotation numbers in the range of 0–0.12. Such passages are encountered close to the mid-chord sections of the turbine blade. Normal ribs (e/Dh=0.3125 and P/e=8) are placed on the leading and the trailing sides only. The experiments are conducted in a rotating two-pass coolant channel facility using the naphthalene sublimation technique. For purposes of comparison, selected measurements are also performed in a 1:1 cross section. The local mass-transfer data in the fully developed region is averaged to study the effect of the Reynolds and the rotation numbers. The spanwise mass transfer distributions in the smooth and the ribbed cases are also examined.

Microchannel and Minichannel Heat Exchangers in Advanced Energy Recovery and Conversion Systems

2006 ◽  
Author(s):  
Terry J. Hendricks
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Heat Exchangers ◽  
Energy Recovery ◽  
System Analysis ◽  
Performance Metrics ◽  
Wide Spectrum ◽  
Thermal Characteristics ◽  
Industrial Process ◽  
Process Energy

Energy recovery is gaining importance in various industrial process applications because of rising energy costs and geopolitical uncertainties impacting basic energy supplies. Various advanced energy recovery / conversion technologies will require high-performance heat transfer characteristics typical of micro- and mini-channel heat exchangers to achieve energy recovery performance targets and requirements. Initial engineering scoping studies have focused on advanced thermoelectric generator (TEG) systems assuming exhaust gas temperatures of 1033 K (1400 °F) and ambient environment temperatures of 300 K. The engineering analysis used a coupled, integrated thermoelectric (TE) system analysis accounting for the heat exchange / heat transfer performance at both the hot and cold sides and optimum TE device performance to properly predict the power output potential, resulting temperatures and temperature differentials, TEG design and interface requirements, and thermal characteristics across a wide spectrum of potential operating temperature conditions. Modular TEG's capturing about 5% of typical industrial process (e.g., glass manufacturing process) exhaust flows appear to have potential power outputs of 4 - 6 kW using advanced TE materials. Hot-side & cold-side heat exchange requirements were quantified and performance metrics evaluated to enable effective implementation of advanced TEG systems in industrial process energy recovery. Hot side heat transfer requirements create serious engineering, and possibly, scientific challenges to enabling energy conversion systems, including TEG's, in industrial process energy recovery. Future advanced heat transfer R&D is necessary and should occur in parallel with on-going advanced TE materials and systems R&D.

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