Study of condensation at the surfaces of tube with gradient heat flux measurement

Abstract

Gradient heat flux measurement is used for study of heat transfer during condensation of water steam at inner and outer surfaces of tube. Experimental setups allow producing experiments with minimal distortion of condensate film flow. Experiments were carried out for different directions of steam and cooling water flows and for different angles of tube inclination relative to the vertical. Heat transfer coefficients and their change along the length and perimeter of tube were measured. The obtained data allow to study formation of condensate film and parameters of film motion. The results are corresponding to classical ideas.

Gradient Heatmetry Advances

“…Mendeleev All-Russian Institute for Metrology (VNIIM) jointly created the calibration bench shown in Figure 4. The bench allows one to calibrate in the temperature range from 25 to 800 • C. The bench is a cylinder with a coolant jacket (2). The stainless steel tube (4) with a heater (5) inside is fixed on the cylinder axis in tube holders (3).…”

“…This kind of measurement is important for industry development. Heat flux recording devices have become widely used in laboratory experiments (study of convective heat transfer [1], and heat transfer during phase transition [2,3]), technology (boiler plants, nuclear power plants, electric machines [4]) and everyday living (climate control, energy efficiency of buildings and structures [5]). Monitoring and control systems based on heat flux measurement [6] are of particular interest.…”

“…The first peaks on both curves correspond to the second critical heat flux; they range from 0.46 MW/m 2 to 0.63 MW/m 2 . q, MW/m2…”