This paper starts with an introduction to the concept of momentum current. It is followed by a discussion of its strength and density with the aid of several analogies made between momentum current and electric current. Based on the novel concepts of thermal charge and its quantity (entropy), the analogies are extended to entropy current. The broadened analogies cover the driving force and resistance of each current, the effects that the strength or density of each current has on their conductors, and the relationships between the above three currents and energy current, etc, which involve practical problems such as industrial safety, human thermal sensation, process control parameters as well as energy carriers and energy transport.

本文首先介绍了动量流的概念。接下来，借助于动量电流和电流之间的几种类比，对其强度和密度进行讨论。基于热电荷及其数量（熵）的新颖概念，将类推扩展到熵电流。拓宽的类比涵盖了每种电流的驱动力和电阻，每种电流的强度或密度对其导体的影响以及上述三种电流与能量电流之间的关系等，这些涉及实际问题，例如工业安全性。 ，人类的热感觉，过程控制参数以及能量载体和能量传输。