Is there a word for the sound that is made after taking a sip of hot coffee/tea?

Sometimes, after people take a sip of hot coffee or tea and send it down their throat, they make this sound originating from the front of their mouth. Something like "Aaah" — exhaling a little steam. Usually to express delight in the deliciousness of the drink. Is there a word for this sound?

For example:

He took a slurp from his coffee and ____ in delight.

What could go in the blank?

Solution 1:

Although it is usually used in a less positive manner, you could say that the person is letting out a sigh:

to let out one's breath audibly, as from sorrow, weariness, or relief.

Solution 2:

The only word I know that would describe the sound is slurp. If you wanted to use that, you’d have to find another word to use instead of the slurp you’ve already got. Perhaps He took a sip from his coffee and slurped in delight.

Solution 3:

You mean the aaaah sound?

A modernist might write:

He took a slurp from his coffee and ahhed in delight.