Not only the special node method for dealing with the different condi- tions of boundary and support is used, but also the method of continuous beam for solving the internal force of multiple opening box-type culvert program is suggested.

Comparison of physical models of boiling heat transfer of porous surface tubes for heat exchangers;

Study of scaling characteristics on sintered porous surface tubes with copper nickel alloy base in NaCl solution;

Aiming at the questions of high energy consumption after the technological modification for enlarging its production,three retrofit schemes are presented:Using a high-efficient lamella heat exchanger instead of the conventional shell and tube heat exchanger,using a high flux porous surface tube in the reboiler,and using a water heat medium preheater to recover three furnaces' surplus heat.

In this paper, the heat transfer performance of the pin-fin tube, porous surface tube and smooth tube which are all made of B30 was first researched on the condition of convection.

In this paper,water was used as boiling medium,and the boiling heat transfer characteristics of smooth tube and three other kinds of enhanced tubes including integral pin-fin tube,porous surface tube and winded pin-fin tube were studied experimentally.

The dimensionless formulae of pressure head curve was deduced by establishing fluid differential equation of perforated pipe and a theoretical method to calculate the catch uniformity of perforated pipe was given.

In this paper,thetype of flow in perforated pipe was analysed,and the influence of which on calculating waterhead losses was simulated by computer programme.