You can file for divorce in TN even if you can't locate your spouse. Here is a great resource for forms, TN divorce law, and instructions.

http://www.divorcelawinfo.com/states/tn/tennesee.htm

You can also find good attorneys in your area to help you with the process. It can be time consuming and confusing to do on your own, so you may be better off to hire a divorce attorney, especially since your wife has not been in contact.