Question: which method represents the transfer of heat in a fluid
[{'answer': 'convective circulation', 'provenance': [{'wikipedia_id': '19593167', 'title': 'Heat', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]