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Abstract of "MAIN PROPERTIES AND KINDS OF HIGH ROTATING HEAT AND MASS EXCHANGERS"

DOI: 10.1615/ICHMT.2000.TherSieProcVol2.700
154 pages

Wlodzimierz Wawszczak
Heat and Mass Transfer Group, Institute of Turbomachinery, Technical University of Lodz, street: Wolczanska 223, 93-005 Lodz, Poland

Abstract

The four thermal-flow rules of high speed rotating heat exchangers are determined. They are shortly formulated as follows:

  1. = The minimum of mass leakage ratio is a function of the partition position angle and diameters of the rotor,
  2. = The rotor temperature is approximately constant for any kinds of materials,
  3. = The heat transfer rate is a linear function of the rotor speed and the temperature difference at the heat exchanger inlet,
  4. = The high rotating heat exchanger has the highest intensity of forced convection heat by a correlation Nusselt number as a function of the Graetz number.
The overall heat transfer coefficients attain the values of about 180 W/m2K (for gas Re = 800) and more. Many types of rotors are investigated, for example made of corrugated sheets, wire meshes or witch radial drilled holes or sintered small balls. This heat regenerator acts simultaneously as a sucking and forcing nonadiabatic fan. The characteristics of a pressure increment as a function of the volumetric flow rate and rotor speed are presented. The physical types of the heat exchanger have many design variants, first of all as one or multirotor devices and with auxiliary equipment (e.g. injectors, filter gauzes, etc.). They may work as cocurrent or countercurrent flow systems of hot and cool gases. The relevant porous material of the rotor, characterized by high porosity and specific properties, can be applied in different fields of industry, i.e. as a heat and mass exchanger, catalyst, absorber, humidifier, filter etc. It is an experimental work with theoretical, design and technological elements.

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