3D心形参数化曲线

3D 心形参数化曲线：

u(theta)=cos(theta)(sin(theta)sqrt(abs(cos(theta)))/(sin(theta)+7/5)-2sin(theta)+2)(theta(40pi-theta)); 
v(theta)=sin(theta)(sin(theta)sqrt(abs(cos(theta)))/(sin(theta)+7/5)-2sin(theta)+2)(theta(40pi-theta)); 
w(theta)=50*theta; 
theta =[0,40*pi]

效果见下图，基于COMSOL Multiphysics做的管道传热模型：