Correct

热流

/ rè liú / 
Strokes

Definition

heat flow

Example

As a Noun

warm current

1
Yī
一
gǔ
股
rèliú
热流
zài
在
xīntóu
心头
yǒng
涌
qǐ
起

a warm current of emotion rose in one's heart

As a Noun

thermal current; heat current/flow