pitch number

The results indicated that the pitch number, throat diameter, flow rate and temperature has great effect on the resistance of throttle set;

研究结果表明：节数、喉部直径和流量、温度等参数对节流件阻力特性的影响较大。

An empirical equation for hydraulic resistance was obtained after the effects of pitch number of throttles, throat diameter, temperature, pressure, flow rate and outside heat source on the hydraulic resistance of throttle set were examined.

通过研究节数、喉部直径以及温度、压力、流量和外部热源等参数对节流件阻力特性的影响，获得了计算节流件阻力的经验关系式。

fixed head heat exchangers with type 25 tubes and square 32 tube pitch; number and pattern of tubes

两端固定的壳管式热交换器.内管直径25.方形管心距32.内管的数目和配置

fixed head heat exchangers with type 20 tubes and triangular 25 tube pitch; number and pattern of tubes

两端固定的壳管式热交换器.内管直径20.三角管心距25.内管的数目和配置

fixed head tubular heat exchangers with type 25 tubes and triangular 32 tube pitch; number and pattern of tubes

两端固定的壳管式热交换器。内管直径25.三角形管心距32.内管的数目和配置