Acer, the world’s number two computer vendor, said stronger-than-expected sales of its Google Android touchscreen phone, named Liquid, have led to shortages of the device, reports BusinessWeek. Acer expects its smartphone sales, including those using Microsoft’s Windows system, to total between 2 million and 3 million units this year. Acer expects to ship at least 250,000 Liquid handsets by the end of this quarter, compared with initial expectations for 150,000 to 200,000. Smartphones will account for 10 percent of Acer’s revenue in about three years, one year later than initial company predictions because of last year’s global economic slump.