trigger on Account (after insert, after update) {
  Account[] records = new Account[0];
  for(Account record: Trigger.new) {
    if(meetsCriteria(record)) {
      records.add(record);
    }
  }
  if(!records.isEmpty()) {
    System.enqueueJob(FlowCaller(records));
  }
}

public class FlowCaller implements Queueable {
  Account[] records;
  public FlowCaller(Account[] records) {
    this.records = records;
  }
  public void execute(QueueableContext context) {
    Map<String, Object> params = new Map<String, Object> {
      'accounts' => records // accounts is flow sobject collection
    };
    Flow.interview.DoSomethingCool theFlow =
      new Flow.Interview.DoSomethingCool(params);
    theFlow.start();
  }
}