The following paper presents the results of experimental research on the condensation of R134a and R404A refrigerants in horizontal tubular mini-channels during impulsive hydrodynamic instabilities. Due to the complexity of the problem, it will be presented in two parts. The first part covers the results of experimental research on the influence of impulsive instabilities during the development of condensation of R134a and R404A refrigerants in mini-channels. The second part will cover the decay of condensation for similar conditions. The paper also provides a definition and conditions of the initiation and propagation of impulsive instabilities. Special attention was paid to the possible occurrence of characteristic instabilities during condensation in mini-channels, so-called capillary blocking.

The experimental investigation was based on the condensation of R134a and R404A refrigerants in horizontal tubular mini-channels with internal diameters of D = 0.64; 0.90; 1.40; 1.44; 1.92; 2.30 and 3.30 mm. Propagation of impulsive instabilities was a result of a sudden change in the refrigerant flow-rate inside mini-channels.

下面的论文介绍了在脉冲流体动力不稳定性过程中，R134a和R404A制冷剂在水平管状微型通道中冷凝的实验研究结果。由于问题的复杂性，将分两部分介绍。第一部分涵盖了R134a和R404A制冷剂在小通道中冷凝过程中脉冲不稳定性影响的实验研究结果。第二部分将介绍相似条件下凝结的衰减。本文还提供了脉冲不稳定性引发和传播的定义和条件。特别注意的是在小通道冷凝过程中可能发生的特性不稳定性，即所谓的毛细阻塞。

实验研究基于R134a和R404A制冷剂在水平内径为D  = 0.64的水平管状微型通道中的凝结；0.90；1.40; 1.44; 1.92; 2.30和3.30毫米。脉冲不稳定的传播是微型通道内制冷剂流量突然变化的结果。