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We measure the drag reduction (DR) based on the global dimensional torque as a function of the global gas volume fraction a_global over the range 0% to 4%. We observe a moderate DR of up to 7% for Re = 5.1 x 10^5. Significantly stronger DR is achieved for Re = 1.0 x 10^6 and 2.0 x 10^6 with, remarkably, more than 40% of DR at Re = 2.0 x 10^6 and a_global = 4%.\n  To shed light on the two apparently dif"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1111.6781","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2011-11-29T12:04:34Z","cross_cats_sorted":[],"title_canon_sha256":"caa16ce8450a1e3a31a9890cabe1014ff0fd9ce0b7a1060100f839669802be60","abstract_canon_sha256":"61c50807d4b045a8d00ebf03e0f3c43a352c4797acf8171c66fa2392a6384de4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:25:11.486351Z","signature_b64":"Gv2BfIz5hvHDSu7CZZKs75GmhM82QUPL7I3Mr3QqAlOx1PFiEeKOxm6s2an2Qgtm5vAZJGS85uO2AAs3IzcUBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0cf28f6a68f404b5a0daa3b056a2eb8821ee10df414faa0011d0014f36e95715","last_reissued_at":"2026-05-18T02:25:11.485802Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:25:11.485802Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The importance of bubble deformability for strong drag reduction in bubbly turbulent Taylor-Couette flow","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Chao Sun, Daniela Narezo Guzman, Dennis P. 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