particleEmitter.angularVelocity = 100;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
particleEmitter.angularVelocity = 100;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
particleEmitter.angularVelocity = 100